Sanitation is more important within the confines of a spaceship or space station than on Earth.
Studies have shown that the population of some microbes can increase extraordinarily in microgravity and confined spaces. This means many infectious illnesses could easily spread to everyone aboard. The eating equipment, dining area, toilet and sleeping facilities in an orbiter are regularly cleaned to prevent the growth of microorganisms. Garbage and trash are also sealed in plastic bags. Shuttle travelers don't have to do many dishes.