The boat above me in Rack Storage dripped oil over the back of my transom. Not sure if it's engine oil or something else. I wiped as much as I could off using 409 but it appears this may have left a stain (the gel-coat is slighly oxidized).
Is 409 bad for fiberglass and what should I use to remove the staining?
Is 409 bad for fiberglass and what should I use to remove the staining?