Cross-Contamination Prevention and Cleaning/Sanitizing
What you must know
Cross-contamination is prevented by separation: separate cutting boards, utensils, and storage zones for raw animal foods vs. ready-to-eat (RTE) foods. Store raw foods by cook temperature-top shelf lowest-risk RTE, bottom shelf highest-cook-temperature raw foods (poultry lowest). Color-coded boards help. Never store raw food above RTE food in a cooler.
Cleaning removes soil; sanitizing reduces pathogens to safe levels. You must clean before sanitizing-sanitizer does not work on dirty surfaces. Chemical sanitizer concentration matters: chlorine commonly 50–100 ppm, quaternary ammonium per label. Test strips verify concentration. Manual warewashing is a 5-step process: scrape/soak, wash (110°F+), rinse, sanitize (per label contact time), air-dry. Mechanical dish machines: wash 150–180°F depending on type, final rinse 180°F for hot-water sanitizing.
Traps
Questions confuse cleaning with sanitizing or imply you can skip washing. Another trap: air-drying is required-toweling recontaminates. Also, sanitizer contact time (often ~30 seconds for chlorine) is frequently tested; "dip and immediately use" is wrong.
Rule of thumb
Remember the order wash → rinse → sanitize → air-dry, and store raw foods by descending cook temperature from bottom up (poultry on the lowest shelf).