Product Description:These wash cloths are machine washable and dryable. If you've used cotton wash cloths before, you know that they can sometimes smell dirty after a few usings. To avoid this smell, wash them in the dishwasher on hot water. If you don't have a dishwasher, pop them into the microwave for 10-15 seconds after you've washed them. All the bacteria will be gone. Easy as that!