Microfiber cloths are fantastic and an absolute must for cleaning around your home. These cloths do get dirty and need to be cleaned. Heat destroys then, and certain chemicals, like bleach, melt them so you have to be very careful. To clean your microfiber cloths, soak them in a warm, not hot, water bath with dish soap for about an hour. Then wash them in your washing machine using the lowest temperature setting, gentle cycle, and regular detergent. Do not use any bleach or fabric softener, this will destroy them. Let the microfiber cloths air dry and they should be good as new!