WS – Water/Solvent Cleaner Spot clean with a mild solvent, an upholstery shampoo, or the foam from a mild detergent. When using a solvent or dry cleaning product, follow instructions carefully and clean only in a well-ventilated room. Avoid any product that contains carbon tetrachloride or other toxic materials. With either method, pretest a small area before proceeding. Always rinse promptly with clean water.