Your corset should be Dry Cleaned, and never washed in a washing machine. The layers of fabric and the boning prohibit machine washing. You may spot clean your corset with a damp cloth. For light freshening a product like "Febreze" can be used on the inside of your corset. After a light misting hang your corset to dry over the back of a chair or a clothes hanger.
corsets are dry clean only although alot of people gently hand wash them considering our steels are stainless steel. But yeah its not a great idea to wash or dryclean these regularly. To prolong your visit to the cleaners its a good idea to wipe the corset down after every use with a damp cloth to remove any excess sweat or body oils that can accumulate within that period of wear.