FSR 790 Fiberglass Stain Remover 16ozFSR (Fiberglass Stain Remover) is a unique stain absorbing gel that is ideal for removing oil, rust, exhaust, waterline and transom stains. Works like magic to clean up fiberglass stains! Use anywhere else fiberglass stains may crop upshower stalls, furniture, etc. Use for removing road soil from trailered boats and recreational vehicles. Requires no sanding or compounding. Simply apply with a brush, sponge or cloth. Wait a few minutes and then wipe