My 23 year old Hunter 22 is showing some discoloration in the interior fiberglass. The best description I can give for the appearance is "motely." Nothing I've tried seems to help. The discoloration seems to be beneath the gel coat and therefore isn't affected by normal cleaners and polishing compounds. The only thing I can think of is something, such as mold, leaching through via the unfinished sides of the interior fiberglass. I say this because the discoloration seems to be confined to the lower portion of the cabin on the outsides of the storage compartments beneath the seats. Can anyone tell me what is going on and perhaps a cure. Thanks