Lifetime folding chairs feature a high-density polyethylene (HDPE) plastic seat and back. HDPE is easily cleaned with soap and water. The material is virtually stain-resistant. If soap and water does not get it cleaned up, you might also try a mild abrasive, like Soft Scrub. Thus, Lifetime chairs rarely need any additional work done on the seat and backs. The frame of the chair is made with poweder-coated steel. The powder coating helps resist rusting for indoor and outdoor uses. If the chair does get wet, drying the chair off is ideal before storage.