A clean dish refers to a plate, bowl or glass that is free from any food residue, stains or dirty marks. It means that the item has been properly washed and rinsed until it is spotless and ready for use again. The term can also be used in reference to a person who maintains high standards of hygiene and cleanliness in their personal habits or surroundings, much like how one would describe someone as being "clean-cut" or having good "hygiene".