HACCP: Hazard Analysis Critical Control Points Colour coding for cleaning is a system adopted by commercial businesses to reduce the risk of cross contamination within their premises. This system can be applied to all reusable cleaning equipment from mops, buckets and handles to spray bottles, cloths, mop caps and gloves. What is the purpose of colour coding? Color coding’s main purpose is to separate, organize and prevent cross-contamination. This is especially important in the food industry where cross-contamination, allergen cross-contact, and cleaning chemical strength are all concerns.