How to Clean a Commercial Dishwasher: Do You Need Chemicals Like Domestic Models?

In any commercial kitchen, your dishwasher is one of the hardest-working pieces of equipment. Whether you're in a bustling café, a fine-dining restaurant, or a large-scale catering operation, keeping your commercial dishwasher clean is essential for hygiene, performance, and equipment longevity.

A common question kitchen staff ask is:
“Do I need to clean a commercial dishwasher like a domestic one — with cleaning chemicals?”
The short answer is: Yes — but there’s more to it.

This guide covers:

• How to clean a commercial dishwasher step-by-step

• Whether you need cleaning chemicals

• Key differences from domestic dishwasher care

• Pro tips to extend machine life and avoid costly repairs

🧼 Why You Must Clean Your Commercial Dishwasher

Even though commercial dishwashers are designed for heavy-duty, high-speed operation, they still build up:

• Grease and food debris

• Limescale and mineral deposits

• Detergent residue

• Bacteria and foul odours

Regular cleaning ensures:

• Sanitary washing results

• Reduced breakdowns

• Lower maintenance costs

• Compliance with health regulations

🪜 How to Clean a Commercial Dishwasher: Step-by-Step

1. Turn Off and Drain

Start by turning off the dishwasher and draining any leftover water from the tank.

2. Remove and Clean Filters

Take out all filters and rinse them under warm water. Use a soft brush to remove any trapped food particles or debris.

3. Wipe Down Spray Arms

Remove the spray arms (if detachable) and clean out any blockages. Soak in warm water with a degreasing solution for deep cleaning.

4. Clean the Interior

Use a non-abrasive cloth or sponge to scrub the interior walls, floor, and door seals. Pay special attention to buildup in corners and gaskets.

5. Use Commercial-Grade Dishwasher Cleaner

Run an empty cleaning cycle using a commercial-grade descaler or machine cleaner. This helps remove:

• Limescale buildup

• Soap scum

• Odours

⚠️ Note: Do not use standard domestic dishwasher tablets or vinegar—these are often not strong enough for commercial use and can damage components.

6. Clean the Exterior

Wipe down the control panel, handle, and door with a disinfectant-safe surface cleaner.

7. Refill Detergent and Rinse Aid

Check levels of commercial dishwasher detergent and rinse aid. Refill as needed.

🧪 Do I Need Chemicals to Clean a Commercial Dishwasher?

Yes. Just like with domestic dishwashers, commercial models require periodic use of specialized cleaning chemicals — but they must be foodservice-grade and compatible with high-temperature machines.

Recommended Chemical Types:

• Commercial descaler – for removing limescale in hard water areas

• Machine cleaner tablets or liquids – to dissolve grease and grime

• Chlorinated cleaners or sanitizers – for deep cleaning and disinfection

Avoid DIY hacks like vinegar or baking soda, which may corrode seals or void manufacturer warranties.

🆚 Domestic vs Commercial Dishwasher Cleaning

🧠 Pro Tips for Maintaining Your Commercial Dishwasher

• Clean filters daily to prevent clogging and poor wash quality

• Use a water softener in hard water areas to reduce limescale buildup

• Schedule a monthly deep clean with chemical descaler

• Train staff to identify early signs of buildup, smells, or reduced performance

• Consult your machine’s manual for brand-specific cleaning guidance (e.g., Hobart, Washtech, Fagor)

🏁 Final Thoughts

Cleaning your commercial dishwasher isn’t optional — it’s a key part of maintaining hygiene, efficiency, and machine life. While the process shares some similarities with domestic dishwashers, commercial kitchens require stronger, food-safe chemicals and more frequent cleaning.

Whether you’re cleaning a pass-through, undercounter, or conveyor-style dishwasher, always use proper products and follow a consistent routine.
A clean machine means cleaner dishes, fewer breakdowns, and a better kitchen experience.