2.2 Principles of Infection Control: Cleaning, Disinfection & Sterilization

Principles of Infection Control: Cleaning, Disinfection & Sterilization

1. The Three Tiers of Salon Infection Control

Decontamination is the removal of blood, infectious agents, or other potentially hazardous materials from surface areas or tools. Salon infection control operates across three distinct levels of increasing antimicrobial efficacy:

           ▲
          / \
         /   \      LEVEL 3: STERILIZATION
        /     \     Destroys all microbial life, including bacterial spores.
       /───────\    (Steam autoclave: 250°F at 15 psi for 15-30 min)
      /         \
     /           \  LEVEL 2: DISINFECTION
    /             \ Destroys bacteria, viruses, and fungi on non-porous surfaces.
   /───────────────\Does NOT destroy bacterial spores. (EPA hospital disinfectants)
  /                 \
 /                   \  LEVEL 1: CLEANING (SANITE / SANITATION)
/                     \ Mechanical removal of visible dirt, debris, and skin flakes
─────────────────────── using soap, water, and scrubbing brush. MANDATORY FIRST STEP.

Level 1: Cleaning (Sanitation)

Cleaning is the mechanical process of removing visible surface soil, dust, organic matter (keratin flakes, sebum, blood), and chemical residues using liquid soap or detergent, warm water, and physical friction from a clean, sanitized scrub brush.

• Cleaning does not claim to kill pathogens, but it physically removes a large share of surface microorganisms along with the debris that would shield the rest. Colorado's rule puts it plainly: cleaning "does not make multi-use items safe for use."
• Cleaning is the non-negotiable first step: Placing a dirty, debris-coated implement directly into a chemical disinfectant bath is completely ineffective. Organic debris forms a physical barrier that shields trapped microbes and chemically reacts with the disinfectant, neutralizing its active biocidal ingredients.

Level 2: Disinfection

Disinfection is a chemical process that destroys virtually all recognized pathogenic microorganisms—including bacteria, viruses, and fungi—on inanimate, non-porous surfaces.

• Disinfection is the standard regulatory decontamination benchmark for multi-use salon tools (such as cuticle nippers, metal pushers, and pedicure basins).
• Crucially, chemical disinfection does not kill bacterial spores.

Level 3: Sterilization

Sterilization is the highest possible tier of decontamination. It is the complete eradication and destruction of all microbial life, including highly resistant bacterial spores, vegetative bacteria, viruses, and fungal spores.

• Sterilization is achieved through heat and pressure inside an autoclave (typically operating at 250°F / 121°C at 15 pounds of pressure per square inch [psi] for 15 to 30 minutes) or dry-heat sterilizers.
• Colorado's Rule 1.7(A)(16) states that sterilization is not required in salons, and Rule 1.8(A)(1) bars any service that penetrates beyond the epidermis. A salon that chooses to use an autoclave should follow the manufacturer's directions, including routine biological (spore) testing to confirm that the unit works.

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2. Chemical Disinfectants and EPA Registration Standards

All chemical disinfectants used in licensed salons must be registered with the Environmental Protection Agency (EPA). The EPA evaluates chemical efficacy claims and issues registration numbers displayed on the product label.

For general salon implement decontamination, the EPA-registered disinfectant must be classified as a hospital-grade disinfectant with verified testing proving it is:

1. Bactericidal (capable of destroying pathogenic vegetative bacteria)
2. Virucidal (capable of inactivating pathogenic viruses)
3. Fungicidal (capable of killing fungal dermatophytes and molds)
4. Effective against HIV-1 and Hepatitis B Virus (HBV) (or carrying a tuberculocidal claim).

Chemical Formulations Used in Nail Technology

• Quaternary Ammonium Compounds (Quats): Modern quats are the most widely utilized disinfectants in contemporary nail salons. Formulated with advanced quaternary ammonium salts, these solutions are low in odor, have low toxicity when properly diluted, act quickly (many labels specify about 10 minutes of full immersion), and often contain rust inhibitors to preserve stainless steel implements. Implements must remain fully submerged for the entire manufacturer-specified contact time.
• Phenolic Disinfectants (Phenols): Historically popular tuberculocidal agents with a very high pH. Although effective germicides, phenols are highly caustic, can burn skin and eyes, soften and cloud acrylic plastic implements, corrode metal tools, and emit noxious vapors. Due to environmental persistence and toxicity, their use has declined, though they frequently appear on licensing examinations.
• Sodium Hypochlorite (Household Bleach): Household bleach (5.25% to 6.0% sodium hypochlorite) is an economical, EPA-recognized broad-spectrum disinfectant. Infection-control references commonly cite a 1:100 dilution for routine surfaces and a 1:10 dilution (1 part bleach to 9 parts water) for cleaning up a blood spill. In a Colorado salon, any bleach used as the disinfectant must be an EPA-registered product used at its label's dilution and contact time. Bleach is highly corrosive to metals, irritates the respiratory tract, and destabilizes rapidly when exposed to air, light, or heat. Diluted bleach should be mixed fresh each day, and leftover dilution discarded.
• Ethyl and Isopropyl Alcohol: Alcohol solutions must maintain a concentration between 70% and 90% to act as effective disinfectants. Alcohol below 70% lacks sufficient germicidal power, while 99% alcohol evaporates too rapidly and coagulates the outer protein shell of bacteria so quickly that it fails to penetrate the bacterial cell interior. Because alcohol evaporates quickly, tools must remain completely immersed in a closed container for at least 10 minutes, making quats a far safer and more practical choice.

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3. Safe Chemical Handling, PPE, and Solution Maintenance

Technicians must strictly adhere to Occupational Safety and Health Administration (OSHA) standards and manufacturer Safety Data Sheets (SDS) when handling concentrated disinfectants:

1. Always Add Disinfectant to Water: Never pour water directly into concentrated chemical disinfectant. Adding water to chemical causes splashing of full-strength caustic concentrate. Always pour measured water into the container first, then slowly add the measured chemical concentrate.
2. Wear Appropriate Personal Protective Equipment (PPE): Technicians must wear protective chemical-resistant gloves (such as nitrile or neoprene) and splash-proof safety goggles when mixing or pouring disinfectant solutions to prevent chemical ocular injury or contact dermatitis.
3. Ensure 100% Submersion: When immersing multi-use metal implements (cuticle nippers, metal pushers, fingernail clippers), all surfaces, joints, and cutting edges must be completely covered by liquid disinfectant. Implements must not protrude above the liquid level.
4. Use Covered Disinfection Containers: Disinfection trays and immersion jars must remain covered with a tight-fitting lid to prevent airborne evaporation, chemical vapor release, and environmental contamination from nail dust.
5. Enforce Daily Replacement: Disinfectant solutions must be changed daily, or immediately whenever the solution becomes cloudy, turbid, or visibly contaminated with hair, skin, or debris.

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4. Multi-Use Implements vs. Single-Use Porous Disposables

A vital distinction tested on state licensing exams is the classification of salon items as either multi-use or single-use:

• Multi-Use (Non-Porous) Implements: Items fabricated from rigid, non-porous materials—such as stainless steel, glass, hard plastic, or dense fiberglass—can be cleaned and chemically disinfected repeatedly. Examples include metal cuticle pushers, surgical steel nippers, metal fingernail clippers, glass nail files, and foot basin tubs.
• Single-Use (Porous / Disposable) Items: Items manufactured from porous or absorbent materials cannot be reliably disinfected because chemical solutions cannot penetrate deep internal voids without degrading the material. Single-use items must be discarded into a covered trash receptacle immediately after one use on a single client.

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5. Methods That Do Not Count as Disinfection

Colorado's rules name one device outright, and the textbooks PSI uses reject two more:

1. Ultraviolet (UV) light boxes (Colorado rule). Rule 1.7(A)(5) states that a UV light box "is not acceptable for disinfection," and Rule 1.8(A)(2)(d) specifically prohibits licensees from using UV light boxes for disinfection. UV light cannot reach shadowed surfaces, hinges or debris-covered areas. Possessing or storing a prohibited device counts as prima facie evidence of using it (Rule 1.8(A)(3)), so keep disinfected tools in a labeled, covered container instead.
2. Glass bead "sterilizers" (textbook standard). These heat small glass beads, but they heat unevenly and do not reach the whole implement. They are not an EPA-registered disinfectant, so they cannot meet Colorado's definition of disinfection.
3. Formalin or formaldehyde tablets and fumigants (textbook standard). This old practice released formaldehyde vapor into cabinets and drawers. Formaldehyde is a respiratory irritant, a skin sensitizer and a known human carcinogen, and the tablets are not a registered salon disinfectant method.

The common thread: in Colorado, disinfection means a cleaned item treated with an EPA-registered, hospital, bactericidal-viricidal-fungicidal disinfectant at its label dilution and contact time. Anything else is either storage or a hazard.