Janitorial Supplies Michigan – Amerisource Industrial Supply 

Modified from Rochester Midland Corp publication

THE ROLE OF CLEANING AND CLEANERS

 Why does the chemical cleaning product industry exist?  In other words, why is it necessary to clean?  There are many important reasons such as preventing the spread of disease and making our environment a safe and healthy place to live.   Perhaps the best historical example is the Black Death, the terrible plague that swept through Europe during the Middle Ages.  During a short period of time, over 60 million people died, almost one quarter of the world’s population.

 Today, chemicals like disinfectant cleaners and other products that are available, could have prevented a significant number of those deaths.  Due to the fact that sanitation and personal hygiene are such an integral part of our daily lives, we take them for granted.  Yet it is the prime reason why we live in a world in which life expectancy in now double what it was just 200 years ago.  Although there are perhaps hundreds of specific reasons to clean and disinfect, there are eight primary reasons.   They are:

1.  Health (pathogenic bacteria live in soil)
2.  Functionality (some tasks, such as repair, are impossible without cleaning first)
3.  Safety (dirty, slippery equipment and/or facilities are dangerous)
4.  Economics (dirty facilities wear out faster and perform less efficiently)
5.  Product Quality (in some industries, product quality is difficult or even impossible to maintain without cleaning and sanitation – for example, cleaning electronic circuit boards) 
6. Government Agency Requirements (in some industries, for example food processing, the USDA requires cleaning at regular intervals) 
7. Pride and Aesthetic Values (keeping floors and work areas clean, improves worker productivity) 
8. Comfort

 Chemicals provide the major means for most cleaning operations.  One or more of the eight reasons listed above come into play in our every day life.

 A simple definition of the term soil is physical matter out of place.   What distinguishes soil from other physical matter is that it occurs or exists in a location where it is not wanted.  Soils can generally be described as heavy or light, organic or inorganic (or mixtures of both), solid or liquid, viscous (syrupy) or fluid, soluble or insoluble.  Soils also are strongly influenced by heat and other environmental factors.

 Organic soils are derived from living matter – people, plants, animals, foodstuffs, or petroleum.  They are typically residues derived from living things or petroleum – greasy soils (oil), residue from plants or animals (food stuffs), and human matter (blood, urine, bacteria).

 Inorganic soils are primarily composed of dirt and sand.  Mineral deposits, planting soil, hard water deposits, cement, fiberglass residue, and dust are all examples of inorganic soil.  Many soils are mixtures of both inorganic and organic soils.

 A simple definition for a cleaner is a chemical solution that helps to remove soil.  The type of soil encountered and the surface upon which the soil is deposited will be major factors in determining the type of chemical cleaner and the cleaning conditions required for soil removal.  There are a variety of cleaners formulated to remove a variety of soils. 

 TYPES OF CLEANING SOLUTIONS

 When considering cleaning, it is useful to think in terms of what is actually being accomplished.  Consider a hard surface upon which soil is deposited.  In order to remove or clean this soil from the surface via the use of conventional chemical cleaning techniques, three successive actions must occur:

1. The soil must be physically separated from the surface being cleaned.
2. The soil must be broken up and suspended in the chemical cleaning solution.
3. The soil must be physically removed, usually via rinsing or wiping from the surface.T

The primary types of cleaners used for removing soils are listed below:

1.  Detergents
2.  Alkaline Cleaners
3.  Acid Cleaners
4.  Disinfectants
5.  Bacteria and Enzymes
6.  Solvent Cleaners
7.  Emulsion Cleaners
8.  Abrasive Cleaners

 DETERGENTS: Detergents (or surfactants – surface active agents) perform several important functions.  First, they reduce the surface tension for aqueous (water based) solutions that allows for faster penetration of cleaners into soils.  Next, they provide emulsifying action, they chemically attach themselves to the surface of soil particles, solvents, greases, and waxes and keep them suspended (usually in water), so that they can be easily rinsed away.  A detergent cleaner performs four basic functions in order to penetrate and remove soil:  penetration, wetting, dispersion, and emulsifying.  The strength of each of these properties determines the efficacy of a detergent.

 The penetration function of a detergent allows the cleaning solution to flow into the pores of a surface and reach under and around embedded soils.  While surfaces appear smooth, they are actually composed of pores, pits, and crevices, in which soils become entrenched.  Lack of penetration power makes soil removal from surface crevices and pits extremely difficult.

 The surface tension of water and other aqueous solutions acts as a thin, fairly strong, barrier that prevents it from penetrating porous materials like cloth and surfaces.  Detergents increase the wetting ability of water by reducing the surface tension and in turn improving its ability to penetrate surface pours.  Without improved wetting, aqueous solutions would be repelled by surfaces that they are trying to clean.

 Dispersion is the process of breaking up and suspending solid masses of soil above the surface in the cleaning solution so that can be easily removed.  Soil suspension is important because it prevents soil from being redeposited on to the surface, ensuring that it is rinsed away with the cleaning solution.

 Due to the fact oil repels water, the emulsification property of detergents works to break up oily, greasy materials into tiny particles so that they are more easily dissolved in water.  Emulsifying agents actually make water and oil compatible so that greasy soils can be suspended in the aqueous cleaning solution, instead of being redeposited on the surface.

 pH is a term that describes the degree of alkalinity or acidity of a product.  The pH scale ranges from 0 to 14, in which 7 is assigned to representing neutrality.  The range below 7 (approximately 0.5-6.5) represents the acidic scale, with 0.5 rating highly acidic and corrosive, and 6.5 rating slightly acidic.  The lower the number, the stronger the acid.  The range above 7 (approximately 7.5-14.0) represents the alkaline scale, with 14.0 rating highly alkaline and corrosive, and 7.5 slightly alkaline.  The higher the number, the more alkaline.

pH	Examples of Products
Scale	Everyday	Cleaning
0	Sulfuric Acid
1	Stomach Acid	Heavy Duty Acid Bowl Cleaners
2	Lemon Juice	Mild Duty Bowl Cleaners
3	Grapefruit and Orange Juice	Phenolic Disinfectants
4	Tomato Juice	Tannin Carpet Spotter
5	Black Coffee
6	Urine
7	Pure Water	Neutral Cleaners
8	Sea Water	Floor Finish
9	Baking Soda	General Purpose Carpet Spotters
10	Milk of Magnesia	All Purpose Degreasers
11	Ammonia	Non Acid Bowl Cleaners
12	Laundry Detergent	Heavy Duty Spray and Wipe
13	Bleach	Floor Stripper
14	Caustic Soda	Heavy Duty Liquid Drain Cleaner

 pH numbers are also logarithmic.  For example, a pH of 9 is ten times more alkaline than a pH of 8.  A pH of 10 is 100 times more alkaline than a pH of 8.  On the acidic scale, a pH of 2 is ten times more acidic than a pH of 3 and one thousand times more acidic than a pH of 5.

 The advantage of neutral pH cleaners (or cleaners closer to a neutral pH) are that they tend to be safer for the end user and the environment.  For example, neutral pH floor cleaners have the least negative impact on floor finishes.  A high pH can actually yellow or remove floor finish.  Hand soaps are also neutral pH cleaners. 

 ALKALINE CLEANERS:  Alkaline cleaners enhance and speed up the cleaning process.  They often contain either sodium hydroxide or potassium hydroxide which have a strong affinity for surfaces and in turn will work to modify the soil (make it more soluble).  Alkaline cleaners modify insoluble soils to render them easier to suspend and in turn rinse away.  The also make proteins and other alkaline susceptible organic soils dissolvable in water based solutions.  Please note that the majority of, but not all, soils are alkaline susceptible.  Therefore, the majority of cleaners are alkaline.  The alkaline pH range is approximately 7.5 (the least alkaline) to 14.0 (highly alkaline and corrosive).

 ACID CLEANERS:  Although the majority of soils are susceptible to alkaline agents, some are more susceptible to acids.  Acid cleaners are effective against tough inorganic stains like mineral deposits (lime and milk stone), soap film, certain molds, and rust because of their descaling ability.  Descaling involves the removal of soil in layers, the acid eats away at the layers of inorganic matter.  Acid cleaners usually contain either hydrochloric acid, which is good for heavy duty cleaning, or phosphoric acid which is considered to be safer and milder on surfaces than hydrochloric acid.

 DISINFECTANTS: Disinfectants kill or reduce bacteria, fungi, and viruses which cause disease on surfaces, leaving a residue that continues to kill microorganisms.  The chemistry is complex and many varieties are available.  We frequently use quaternary ammonium halides which attack bacteria cell walls.  It should be noted that many other sanitizers with different types of chemistry and chemicals structure are also available. 

 Disinfectant detergents work to destroy harmful bacteria while assisting with the soil removal.  The detergent component has certain ingredients that lift the soil away from the surface so it can be wiped away more easily, while the disinfecting component kills or reduces the bacteria population to acceptable levels.

 Disinfectant detergents (or any other type of cleaning chemical) should not be used simultaneously with the use of another chemical.  For example, a disinfectant cleaner used with an enzyme digester renders both products ineffective.  Mixing products that contain bleach and ammonia can release a toxic gas that could be harmful to the end user.  Products should only be mixed with water.  If two products are necessary to remove the soil one should be used and rinsed away and then the other, they should never be applied or mixed together.  Furthermore, because of the potential to render disinfectants ineffective, federal law prohibits the mixing or use of disinfectants in a manner that is inconsistent with label directions.

 The term hospital grade disinfectant refers to a disinfectant that is effective against a select number of bacteria, in particular Pseudomonas aeruginosa, Salmonellla choleraesius, and Staphylococcus aureus, as well as a variety of other pathogenic organisms.

 Quaternary disinfectants or Quats are good all-purposed disinfectants.  They combat a broad spectrum of disease and odor causing organisms, are low in toxic or irritation properties, and provide odor control.  Additionally. Quats allow for a broader range of fragrances than most other disinfecting agents.  The quaternaries also possess some penetrating and wetting properties that increase the effectiveness of detergents and allow them to better dissolve into solutions.  Quats also tend to be less expensive than other types of disinfectants.

 Phenolic disinfectants or Phenols are also effective against a variety of gram positive and gram negative organisms. As well as the bacillus (type of bacteria) that causes tuberculosis, but are higher it toxicity and irritation properties and have a distinct odor.  Phenols also lack detergency properties and thus do not contribute to the wetting and penetrating functions of a product.

 Phenols are, however, preferred in many health care settings where blood spills and other infectious bodily fluids are more commonly encountered.  Due to the fact that Phenols are tuberculocidal, they are recommended to help people meet the OSHA Occupational Exposure to Blood Borne Pathogens Standard.  OSHA’s Blood Borne Pathogen Standard states that spills of regulated body fluids must be decontaminated with an appropriate disinfectant (which is defined as a tuberculocidal disinfectant) to prevent infection by blood borne pathogens, primarily Hepatitis B and AIDS.

 Although Tuberculosis in not spread through contact with hard surfaces (it is spread by inhalation of airborne particles), OSHA bases the standard on the presumption that killing Tuberculosis indicates that a disinfectant or chemical may have a greater capability for killing Hepatitis B.

 ENYYME AND BACTERIA CLEANERS:  Enzyme and Bacteria cleaners are composed of nonpathogenic (will not cause disease), living bacteria or enzymes that will break down and liquefy organic soils like fats, proteins, carbohydrates and grease, while simultaneously eliminating malodor.  Enzyme and Bacteria cleaners present an alternative to harsher chemical solutions like solvents and strong acids or alkalis, because they are more environmentally sensible, and more user friendly that products with extreme pH.

 The process by which enzyme and bacteria cleaners work is important to understand.  When a bacteria product is applied, the microorganisms are dormant.  They begin to grow and digest the waste that is present (their food source) and in turn multiply.

 Since bacteria don’t have mouths, they break down and metabolize waste by producing enzymes.  The waste that has been broken down is now small enough to be transported or absorbed through the bacteria cell wall.  Once the waste particles are inside the cell, they can be broken down and used as a fuel and energy source. Allowing the cell to reproduce again and again, thus repeating the process.  As long as the organic soils are available as a food source, the process will continue.

 Straight enzyme cleaners are products that contain only enzymes that have been separated from the bacteria that produce them.   These products also break sown soils like grease, starches, and proteins.  Once enzymes have done their work, they are used up and cannot reproduce themselves; in turn they will not be able to degrade any more waste.

 Bacteria products can be advantageous because they last longer and tent to be more effective – if food is available, bacteria are always producing enzymes and multiplying to degrade waste. 

 Enzyme and Bacteria cleaners are currently used primarily for drain line cleaning and odor control.  They can be applied once for a specific odor problem or organic waste clog, or they can be incorporated into an ongoing maintenance program, to minimize waste buildup and reduce the need for costly pumping.  A regular application of an enzyme and bacteria digester can be especially effective in controlling odor problem caused by organic soil build-up in cracks of tile, around the base of toilets, and long the sides of urinals and drains.

 SOVLVENT CLEANERS: Solvent cleaners are particularly effective for the removal of organic soils, and greases, etc.  The solvent removes the soil from the surfaces.  There are a number of different solvents.  The well-known “butyl” solvent is actually glycol ether, which allows aqueous solution to remove oily soils more effectively.  Glycol ether solvents are unique because they can be dissolved in oil or water.

 In some cases, hydrocarbon solvents are used because of their ability to attack greases.  Chlorinated solvents offer even more vigorous attack on oily soils.  However, due to the negative impact on the environment and the user health, many solvent products have been restricted, banned, or planned for future phase out.

 Solvent cleaners are good for removing oil based stains like greasy fingerprints on mirrors and windows.

 EMULSION CLEANERS: Emulsion cleaners are typically solvents that are mixed with detergents or other ingredients to form a stable cleaning product in water.  They emulsify oils (break the oil particles down so that they can be dissolved in water) making the particles compatible with water. For example, furniture polish as well liquid cleansers are often emulsion cleaners that are effective against both water and oil based stains.

 ABRASIVES:  Abrasives clean by mechanically sanding or grinding down a minute layer of the surface.  Abrasives can be useful for removing tough stains, but care should be take not to wear the surface down to the point that it becomes more porous and in turn susceptible to staining.  Heavy-duty cleaners like acid detergents and emulsion cleansers that are miler on surfaces, can often take the place of abrasive powders.  Products like acid bowl cleaners and abrasive stain removers should not be used on a daily basis.

 

 

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