If you have opted for a silicone cat food mat, it is safe to be placed in the top rack of your dishwasher (although it is best if you rinse any cat food debris off first). For any other cat food mats, always read the manufacturer’s cleaning instructions. Most cat food mats will have been designed to at least be washed in warm, soapy water, with care taken to any woven fabric so that it can air dry.