Stern solarium seems rotten
After every ride on salt water I like to wash and clean my boat. Since I go out for a ride almost every day, you can imagine how often my boat is flooded for cleaning purposes.... :S
Recently, I found stern bath platform with huge light brown stains when I come back to the marina on the next day. Also, some dark brown wood scabs suddenly appears on bath platform from time to time and I don't know from where (initially I thought it was stuff coming from security gasoline vapors exhaust system). But recently I found the origin: they come from inside stern solarium as you can see on the pictures.
Is this filled up with wood scabs inside or is something getting rotten?
Any tip on how to fix this by myself? Anyone with same issue?
[sold] 99 Maxum 1900SC / Mercruiser 4.3L V6 190HP (carb) Alpha One Gen II