How To Deep Clean a Commercial Kitchen

America loves to eat out; in 2015, 19 million people reported visiting a full-service restaurant at least once during the year, with 49 million more reporting that they ate in a quick service restaurant in 20161. In addition to restaurants, many buildings that have their own cafeteria and food prep areas use commercial kitchens.

With so many people dining out, it’s critical that facility managers keep their commercial kitchens immaculate; especially because Salmonella, Norovirus and other nasty bacteria love to breed in all the nooks and crannies of prep areas2, including on heavily used equipment. Luckily, we’re here to provide you with tips to deep clean your commercial kitchen, leaving your diners and staff happy and healthy.

Cleaning Commercial Grills & Griddles

The grill or griddle is one of, if not the, most used appliances in a commercial kitchen. Handling the volume of cooking required to keep up with consumer demand means that grime will accumulate on grill surfaces, as well as on the sides and backs of the appliances. It’s recommended that commercial grills and griddles be cleaned at least once a day, especially if handling high volumes. This helps assure proper re-seasoning, reduces possible cross contamination and decreases stubborn grease stains.

  • Step 1. Get the griddle or grill hot and pour one cup of clean cooking or fryer oil onto the grill’s surface. Using a griddle brick or pumice stone, scrub in concentric circles until the grill is clean. Scrape the cooking oil into the grease trap and turn the grill off.
  • Step 2. While the griddle is still warm, pour one cup of club soda or seltzer water onto the surface. The carbonation present in club soda or seltzer water will help break up any stubborn grease deposits. Again, scrub the grill’s surface with your pumice stone or griddle brick in concentric circles and scrape off any of the remaining liquid or residue into the grease trap to be disposed of.
  • Step 3. Apply a half cup of vinegar to the grill surface and spread it evenly across the griddle, taking care to make sure that it doesn’t pool. Rub the grill surface with a rag in concentric circles and then scrape the remainder of the vinegar off of the grill surface into the grease trap for disposal. Vinegar’s acidic nature makes it excellent for lifting stubborn stains and deposits of grease that the club soda may not have removed in the previous step.
  • Step 4. Soak a rag in cooking oil and give the grill surface a good scrubbing; this not only polishes the grill surface, but it also ensures proper decontamination and re-seasoning of the grill. The sides and back of the grill are not impervious to stains, spills and buildup either and they’re often the most ignored surfaces when cleaning.

Tip: Make sure to scrub the sides and back of your commercial grill and other appliances, with an eco-friendly cleaning product and rag. For particularly stubborn deposits or stains, use a combination of baking soda and water to create a paste. Spread the paste on the stain or deposit and then spray with vinegar. Scrub with a sponge or steel wool and wipe clean with a new towel or rag.

Cleaning Commercial Kitchen Ovens

Commercial kitchen ovens are a hot bed for grime, crumbs and other food byproducts due to their heavy and versatile uses. Oven racks should be removed and cleaned separately, with non-toxic cleaner and warm water. Oven racks should also be allowed to dry before being reinserted.

With the racks removed, take care to remove crumb or burnt food byproducts from the interior surfaces of the commercial oven; not only can these lead to bad tasting food, but they also pose a serious fire hazard if they’re allowed to build up excessively. Remove crumbs with a brush or cloth, taking care to remove all loose food debris.

For burned on cheese and other stubborn bits of food boil over and buildup, scrub loose what you can with a wire brush or pad. Create a paste out of baking soda and water and apply it to the leftover residue. After letting the paste sit for a few minutes, spray with vinegar and remove it with a wire brush. Make sure to clean the interior of the oven again if using the baking soda and vinegar; simply scrubbing these liquids away can leave contaminants, tastes and odors in the oven, which will transfer into food after cleaning.

The outside surfaces and door of the oven should also be cleaned with non-toxic cleaner and warm water.

Cleaning Hoods & Exhaust Systems

Exhaust hoods and duct systems are often the most neglected areas of a commercial kitchen when it comes to cleaning. The hood system serves to expel heat, smoke and odors out of the kitchen area, in order to help keep the air clean for staff and regulate temperature. Subsequently, commercial kitchen exhaust hoods are prone to buildup of grease and other filth that can hamper their ability to expel heat and smoke.

The successful function of a commercial kitchen hood and exhaust system is so crucial to the safety of a commercial kitchen, that the National Fire Protection Association drafted a code pertaining to their installation and maintenance. Any commercial kitchen that shrugs off the regular cleaning of their hood and exhaust system not only risk their employee and consumer health, but they also face the probability of high fines and mandatory shutdown if hoods and exhaust systems are found to be unsatisfactory.

While most commercial kitchen crews will scrub the outside of the hood as part of their regular commercial kitchen checklist, the interior cleaning is what really needs to be addressed to ensure safety and optimal food preparation.

Internally cleaning a commercial kitchen hood and exhaust system is a complex and intricate process that requires:

  • Disassembly, cleaning and degreasing of hoods, including filter tracts and grease troughs
  • Removal of roof or wall mounted fans to degrease the base, shroud and blades
  • Cleaning all ducts of the hood’s exhaust system
  • Inspecting and replacing loose and worn out fan belts

Tip: It’s strongly recommended that a specialty commercial kitchen cleaning service be used for internal cleaning of hoods and exhaust systems in order guarantee a deep cleaning and correct reassembly of crucial components of the hood and exhaust system.

Cleaning Commercial Deep Fryers

A commercial deep fryer can be one of the main components of any kitchen that relies heavily on fried foods as part of its menu. As any commercial kitchen chef or fry cook knows, commercial fryers can become filthy as dirty oil is left unchanged and deposits of grime build up, contaminating fry quality and leading to taste contamination. Aside from frequent oil changes, it’s imperative that commercial fryers be cleaned and boiled out.

Boiling out a deep fryer is an excellent process to carry out after every few fryer oil changes and can help ensure that cross contamination doesn’t occur. The process can also increase the life span of the commercial fryer itself, saving you from costly purchases sooner than necessary.

  • Step 1. Remove baskets from the fryer and drain all the grease, disposing of it with an oil caddy in an appropriate bin or deposit location. Allow the fryer to cool and then scrub the inside surfaces with a metal brush to dislodge buildup and fat deposits. Use a cleaning rod in to clean any excess debris out of the drain line, including bits of food or grease. Rinse the fryer with hot water to remove excess fat deposits or any undrained fat that may be left over from the drained grease.
  • Step 2. Let the fryer drain for a few minutes, then fill it with cool water up to about three inches from the top. Add the eco-friendly commercial fryer cleaner of your choice (the amount depends on the product, always read the bottle first!) and boil the mixture for 20 minutes. Once 20 minutes is up, drain the fryer until it’s empty and scrub the inside again, paying attention to any leftover deposits.
  • Step 3. Rinse the fryer thoroughly with cool water; any leftover water or cleaning solution can instantly decrease the quality of the next batch of oil. Let the fryer drain and clean any excess liquid or buildup from the inside with a towel or rag before adding new oil.

Commercial fryer baskets should be washed with standard dish detergent and warm water. If your fryer baskets are especially bad, leave them in for the boiling out process; the water and fryer cleaner mixture will remove extreme cases of buildup and grime. Fryer baskets should still be removed and cleaned manually after the boiling out process to guarantee a thorough cleaning and preserve the integrity of the next batch of oil.

Cleaning Commercial Bread Proofing Drawers & Proofing Ovens

Not all commercial kitchens are created, or cleaned, equally. Depending on the types of foods being offered by an establishment, there may be other appliances to clean. Bread proofing ovens or drawers, for example, should be cleaned to guarantee that the proofing process is undisturbed by leftover yeast or grime. Proofing drawers and ovens should be cleaned as often as possible.

If your proofing oven has racks, they should be removed and cleaned with an eco-friendly cleaning product, water and a sponge or brush. The water pan at the bottom of proofing drawers or closets should be removed, emptied and sanitized before being filled with clean filtered water and replaced for the next use. The interior of the proofing drawer should also be sanitized often and allowed to dry before being used again.

Cleaning Touchpoints & Other Crucial Areas

Countertops, sinks and other heavy touchpoints in a commercial kitchen need to be cleaned every day after service has stopped. Countertops should be disinfected with non-toxic cleaner and wiped down thoroughly with clean towels or rags. The sides, backs and accessible undersides of counters and prep areas should also be scrubbed thoroughly with non-toxic cleaner in order to remove grime, viruses and bacteria.

Sink basins should be cleaned and scrubbed with sponges or brushes, warm water and a non-toxic cleaning solution. Faucets and knobs should be cleaned thoroughly as well, in addition to any surrounding counter space or floors in close proximity to the sink. Floor and rubber mats need to be dealt with as well; use a mop and non-toxic cleaning solution with water to clean floors and take rubber mats outdoors to be washed with a non-toxic cleaner and water. Mats should also be allowed to dry before being placed back into the commercial kitchen to prevent injury and the transfer of water inside.

Commercial walk-in freezers are another area that requires specific care. Read our full feature on cleaning commercial walk-in freezers here.

While this brief guide serves as a great starting point for deep cleaning a commercial kitchen, there’s still much to know. Contact us for a commercial kitchen cleaning consultation to learn how we can ensure an immaculate commercial kitchen that ensures the health of your loyal diners and staff.


  1. Eating Out Behavior In The U.S. – Statistics & Facts, Statista
  2. Food Poisoning Bacteria And Viruses,