Our 89 23 had a leak in the anchor locker drain ,I was not aware of it, must have happened late last year, the result was water sitting all winter in that foremost compartment . So the carpet that covers that entire area of the boat had this nasty mold on it , I thought we might have to replace it, my wife started cleaning with some clorox clean up with bleach , it got off all of the mold, it did such a great job she kept going , the entire inside of our boat looks like new, there were stains there that we had treated with all sorts of carpet/upholstery cleaner that cleaned right up , in the process she did manage to ruin a set of her sweats, but the carpet sure looks great, I would have been concerned about using this stuff if I hadnot figured we could not do any harm, so thought I would pass it on , regards Mike Bacome