Some food – e.g. tomato based food can stain, especially plastic items in the load and / or the machine. The stains are often impossible to remove. WE recommend not to wash plastic items together with such food. Pre rinsing and daily machine cleaning can reduce this problem. * Iron deposits in the water supply may lead to an overall yellow or brown film. You will need a special water softener filter in the water supply line to prevent this. (contact Warewashing Solutions regarding best filter selection.)