It is always best to consult the cleaning guidelines from your dishwasher's manufacturer. Some dishwashers have an interior made of plastic while others are made of stainless steel. Please note that bleach tablets work great on plastic interiors, but chlorine bleach may damage a stainless steel interior. Consult the manufacturer's guidelines on the use of natural cleaning products like vinegar. In general terms, you should clean the dishwasher's twist-out filter (usually located on the bottom of the dishwasher) with a simple rinse to remove food particles. Remove the silverware baskets and clean them thoroughly in the sink too.