Cleaning vs Sanitising in Food Safety

Why the Distinction Matters In everyday language, "cleaning" and "sanitising" are often used interchangeably. In food safety, however, they are two distinct processes, each serving a different purpose, and both are essential for maintaining a safe food handling environment. Confusing or combining these steps is one of the most common food safety errors in commercial kitchens — and one that can have serious consequences. Under FSANZ food safety standards (Standard 3.2.2), food businesses must ensure that surfaces, utensils, and equipment that come into contact with food are both clean and sanitary. This means a two-step process is required: cleaning to remove visible contamination, followed by sanitising to reduce bacterial numbers to safe levels. Neither step alone is sufficient. What Is Cleaning? Cleaning is the physical removal of visible soil, food residue, grease, and other debris from a surface. It is done using water, a suitable detergent, and mechanical action such as scrubbing, wiping, or pressure washing. Cleaning serves several important purposes: It removes the visible contamination that can harbour bacteria and provide nutrients for bacterial growth. It removes food residue that could attract pests. It prepares the surface for effective sanitising — sanitisers cannot work properly on dirty surfaces because organic matter (food, grease) inactivates or dilutes the active ingredients. It improves the appearance and condition of the kitchen, equipment, and utensils. A surface may look clean after this step, but "visually clean" does not mean "microbiologically safe." A benchtop that has been wiped with detergent may look spotless but could still harbour thousands of bacteria that are invisible to the naked eye. This is why sanitising is the essential second step. What Is Sanitising? Sanitising is the process of reducing the number of bacteria on a clean surface to a level that is considered safe. It does not sterilise the surface (eliminate all microorganisms) but reduces bacterial populations to acceptable levels as defined by food safety standards. Sanitising can be achieved through two methods: Heat Sanitising Heat sanitising uses hot water to kill bacteria. For manual sanitising, immerse items in water at 77°C or above for at least 30 seconds. Commercial dishwashers typically sanitise through a final rinse cycle at 82°C or above. Heat sanitising has the advantage of leaving no chemical residue and is effective against a broad range of bacteria. Chemical Sanitising Chemical sanitisers are solutions applied to surfaces after cleaning. The most common types used in Australian commercial kitchens include: Quaternary Ammonium Compounds (QACs or quats): Effective, relatively non-toxic, non-corrosive, and odourless. QACs are the most widely used chemical sanitisers in the food industry. They require a contact time of at least 30 seconds to 1 minute to be effective. Chlorine-based sanitisers (sodium hypochlorite or bleach solutions): Very effective and fast-acting, but can be corrosive, have a strong odour, and can bleach surfaces. Typically used at concentrations of 100-200 parts per million (ppm) for food contact surfaces. Iodine-based sanitisers (iodophors): Effective but can stain surfaces and have a distinctive colour that makes it easy to see coverage. Hydrogen peroxide-based sanitisers: Environmentally friendly and effective against a broad range of organisms, but can be more expensive. The Correct Cleaning and Sanitising Procedure The standard five-step cleaning and sanitising procedure, as outlined by the Victorian Department of Health , used in Australian food businesses is: Pre-clean (scrape and rinse): Remove loose food debris by scraping, sweeping, or rinsing with warm water. This step reduces the amount of organic material that the detergent needs to deal with. Wash (clean): Apply a suitable detergent and warm water (40-50°C is usually optimal for general cleaning). Use physical action — scrubbing with a clean cloth, brush, or scourer — to remove remaining soil and grease. Work systematically from cleaner areas to dirtier areas. Rinse: Rinse the surface with clean water to remove all detergent residue. Detergent residue can interfere with the effectiveness of the sanitiser in the next step. Sanitise: Apply the sanitiser according to the manufacturer's instructions, paying attention to the correct dilution rate and the required contact time. The surface must remain wet with the sanitiser for the entire contact time to be effective. Air dry: Allow the surface to air dry completely. Do not wipe with a cloth, as this can re-contaminate the surface. Air drying also allows any remaining sanitiser to continue working. Common Mistakes That Compromise Effectiveness Understanding the correct procedure is important, but so is understanding what can go wrong. These common mistakes undermine the effectiveness of cleaning and sanitising: Sanitising Without Cleaning First This is the most fundamental error. Spraying sanitiser on a greasy, food-soiled surface is largely ineffective because the organic material shields bacteria from the sanitiser and neutralises the active ingredients. Always clean before you sanitise. Incorrect Dilution of Sanitisers More is not better when it comes to chemical sanitisers. Using too much sanitiser can leave harmful residue on surfaces, while using too little may not achieve adequate bacterial reduction. Always follow the manufacturer's dilution instructions and use measuring equipment rather than guessing. Insufficient Contact Time Chemical sanitisers need time to work. If a sanitiser requires 60 seconds of contact time, spraying and immediately wiping the surface dry will not achieve effective sanitisation. Leave the sanitiser on the surface for the full recommended time before allowing it to air dry. Using the Same Cloth for Everything A single cloth used across multiple surfaces spreads bacteria rather than removing them. Use colour-coded cloths for