USE ON SHOWERS AND SPAS, TOO! FSR is a unique stain absorbing gel that serves a variety of purposes both ashore and afloat. It`s ideal for removing oil, rust, exhaust, waterline and transom stains, yet it can also be used anywhere else fiberglass stains may crop up- shower stalls, furniture, etc. Use for removing road soil from trailered boats and recreational vehicles. Its non-abrasive quality means that it`s safe to use on white painted surfaces as well as on gel-coat. Requires no sanding or compounding. Simply apply with a brush, sponge or cloth. Wait a few minutes and then wipe off or rinse. -Great for exhaust and waterline stains -Removes rust from stainless steel stanchions and railings -Excellent for removing "rust bleeders" from the hull or deck -Removes road dirt from RV`s and trailer boats -Safe on white painted surfaces -Removes rust stains from clothing, sail cloth, and other fabrics TIP: Test a small area first to be sure FSR will not damage finish.