Soft Scrub Taking a bath will never be the same in bathrooms equipped with The Soft Bathtub. According to the manufacturer and several commercial users, the tubs provide superior durability and insulating properties, and are cleaner, safer, and, of course, more comfortable than conventional tubs. The United Cerebral Palsy Residential Center of Seattle, Wash., which has used The Soft Bathtub since 1985, gives it high marks for its performance in a very demanding clinical setting. The twenty or more baths performed daily in each tub represent roughly five times normal household use. What makes the tub "soft" is about an inch of urethane foam injected between a hard, glassfiber- reinforced polyester shell and a tough, pliable, slip-resistant skin. The urethane elastomeric skin cleans easily and