Description MSR Black Stain Remover quickly removes unsightly stains from fiberglass, vinyl, plastic, painted surfaces. It begins working on contact. The special buffered-bleach formula will not harm vinyl upholstery or threads. It is a much safer alternative to using regular laundry bleach, and can also be used around the home or in RVs wherever stains are a problem. Removes stains on contact without heavy scrubbing. Simple to use; spray on, scrub lightly and rinse off stains. Safe for use on fiberglass, painted surfaces, rubber, plastic and vinyl headliners, bolsters and upholstery. Special buffered formula will not harm vinyl upholstery or thread. Does not weaken fabric or thread.