Sanitation, Disinfection, and Safety
Know the words cold
Sanitation reduces the number of microbes on a surface. Disinfection destroys most pathogenic organisms on nonporous surfaces using an EPA-registered product. Sterilization destroys all microorganisms, including spores, and is not what a shop achieves with a spray bottle. Questions punish candidates who use these terms interchangeably.
The order matters
Clean first, then disinfect. Organic debris - hair, skin, shave cream, blood - inactivates disinfectants, so an implement that is dropped straight into disinfectant without cleaning may never be properly disinfected. Use the product exactly per the label: correct dilution, full immersion or full wet contact, and the full contact time. "Hospital-grade" simply means the product is EPA-registered for hospital use, which usually means it is effective against a broad range of organisms - but only if used correctly.
Porous vs nonporous
Nonporous implements (shears, clippers, combs, metal tools) can be cleaned and disinfected. Porous items (cotton, neck strips, wooden sticks, emery-type files that cannot be cleaned) are single-use and discarded. Electrical tools are cleaned, then wiped with a disinfectant approved for them, following the manufacturer.
Safety and safety nets
Handwashing before and after each client, fresh capes and neck strips, clean and dirty storage separated, covered waste containers, a sharps container for blades, SDS sheets on hand, and safe cord and floor practices. Bleach solutions for blood spills follow OSHA-type guidance (for a blood spill, a fresh 1:10 dilution of household bleach is the classic formula) and are not for routine metal tool care because bleach corrodes steel.
Traps
Skipping contact time, topping off a disinfectant jar with water, storing clean tools in an open drawer, and assuming a spray "sanitizer" disinfects.
Worked example: Clippers used on a client. Remove the blade, brush off hair, wash with soap and water, dry, then disinfect the blade and housing with an EPA-registered product for the labeled contact time; install a fresh or disinfected blade before the next client.