FSR Fiberglass Stain Remover is the best there is!
It is a unique stain absorbing gel that serves a variety of purposes both ashore and afloat.
Comes in two convenient sizes.
It's ideal for removing oil, rust, exhaust, waterline and transom stains on your boat.
Removes rust from stainless steel stanchions and railings.
Excellent for removing “rust bleeders” from the hull or deck.
Removes rust stains from clothing, sail cloth, and other fabrics.
FSR can also be used anywhere else fiberglass stains crop up— shower stalls, spas, 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