11 May
2003
11 May
'03
10:22 a.m.
I use toilet bowl type cleaners to take tough stains off of fiberglass. I doesn't ruin the gelcoat and 30+ yrs of doing it on my boats has never damaged anything. The acids have changed throughout the yrs but these products still work. Do a couple of quick applications with rinses to get the idea how strong it is. Rinse well and don't leave it on more than a few minutes between applications. That's my 02.