Why do commercial dishwashers sometimes not clean well?

2025/01/14

I believe that many people who have worked in the kitchen have used various commercial dishwashers. Have you ever found that the dishes cannot be washed cleanly when using a dishwasher? Today, let SHINELONG editor sort out some common situations that cause commercial dishwashers to not wash cleanly. 1. Usage habits and pretreatment Improper placement of tableware: The tableware is placed too crowded or even stacked, which will cause the spray arm to be unable to fully extend, and the water flow cannot fully cover each tableware, resulting in incomplete cleaning. In particular, tableware placed with the mouth of the bowl facing down is prone to water accumulation and difficult to be washed into the inside by water flow. Solution: Follow the correct tableware placement guide in the dishwasher manual to ensure that there is enough space between the tableware so that the water flow can smoothly enter and take away the stains. There are long dragon dishwashers, ultrasonic dishwashers, and lid-type dishwashers on the market. The placement methods of different types of commercial dishwashers will be different. Insufficient pretreatment: For heavy oil stains, dried food residues, large pieces of residues, etc., if a certain degree of pretreatment is not performed in advance, the dishwasher may be difficult to completely remove. Solution: Before putting the dishes into the dishwasher, simply rinse or wipe the heavily contaminated dishes to reduce stubborn stains and large food residues. 2. Machine maintenance problems Filter blockage: Food residue blocks the filter, affecting water circulation and spraying effect. Solution: Clean the filter regularly to ensure smooth water flow. Pull out the filter at the bottom, remove food residue, and clean it if necessary. Spray arm failure: The spray arm is blocked by food residue or cannot work properly, and cannot spray water normally. Solution: Check whether the spray arm is blocked or damaged, clean the blockage or replace the spray arm. Improper use of detergent: Too much or too little detergent, or using inappropriate detergent, or the wrong proportion of detergent will affect the cleaning effect. Solution: Choose a suitable dishwasher detergent, and strictly follow the recommended dosage and preparation in the manual. Most commercial detergents on the market are concentrated and need to be diluted and prepared with a specific proportion of clean water before use. 3. Water quality and water temperature conditions High water hardness: Minerals and impurities contained in the water may affect the dissolution and cleaning effect of the detergent. Solution: If the water quality is hard, you can consider using soft water or adding softening salt to reduce the mineral content in the water. Formal commercial kitchens will install a purifier at the water inlet to purify the kitchen water. Insufficient water temperature: Water temperature that is too low will affect the removal of grease and stubborn stains. Solution: Make sure that the water temperature of the hot water source connected to the dishwasher is high enough, and the detergent needs to be at a sufficient temperature to stimulate the strongest cleaning ability, or check whether the heating element of the dishwasher is working properly, and contact after-sales maintenance if necessary. 4. Internal problems of the dishwasher Machine aging or failure: Long-term use of the dishwasher or damage to internal parts may also lead to poor cleaning results. Solution: Regularly perform maintenance inspections on the dishwasher, and contact professional maintenance personnel for inspection and repair if necessary. The dishwasher door is not sealed: Poor door sealing may cause water overflow or affect the washing effect. Solution: Check whether the sealing strip of the dishwasher door is damaged or misaligned, affecting the sealing effect, and replace it if necessary. Spray arm blockage: The nozzle of the spray arm may be blocked after long-term use, especially in the case of poor water quality. Solution: If the nozzle is found to be blocked, it can be removed and soaked in food-grade descaling agent for a period of time before cleaning. If the blockage is serious, it can be soaked in oxalic acid. 5. Tableware material and shape restrictions Tableware of special materials: Some tableware of special materials may not be easy to be thoroughly cleaned by water flow and detergent. Solution: For this type of tableware, you can try manual pretreatment or use special detergents to assist in cleaning. If necessary, you can choose to wash by hand. Generally, it is recommended to use a flat-type dishwasher with high versatility and strong cleaning ability for this type of tableware. Irregularly shaped tableware: Irregularly shaped tableware is prone to forming a dead corner for cleaning. Solution: For this type of tableware, you can try to adjust the placement angle or use auxiliary tools dedicated to the dishwasher (such as a tableware rack) to increase the water flow coverage area. The above are the common reasons why commercial dishwashers cannot be cleaned. I hope it can be helpful to you. So today's commercial kitchen sharing is here. If you are interested in commercial kitchen equipment or you are working in the back kitchen, you may wish to follow us. Of course, if you have commercial kitchen needs, you can also send us a private message.

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