That depends on your particular model. Check the care instructions to find out how to best wash your oil mister. If it is dishwasher safe, it's generally only the body of the mister that can go in the dishwasher (not the nozzle/spraying mechanism), and it usually needs to be washed on the top rack. Otherwise, you can clean your oil mister by hand with hot, soapy water. Be sure to rinse it thoroughly afterward.