There is no getting away from the fact that the anti-slip protection on waiters’ trays deteriorates through wear and tear. However, washing them in an industrial dishwasher, as found in a restaurant, destroys the trays very quickly. This is due to the chemicals in the detergent, the pressure and temperature of the water jets, and the time spent washing.

Instead, use soapy wool (svinto) with dish soap and water, rub lightly and wipe with paper towels.

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