IMHO, if your tank doesn't have an inspection port, you need to add one. After seeing (and cleaning) the inside of my tanks, I don't believe there is any way to really clean the tank without getting in there and scrubbing.
The tanks on my O'day came with inspection ports. The tank on my Newport did not. It was pretty easy to add one.
Day To Remember, 1986 O'day 35 For Sale
Deep Blue C, 2002 C&C 110 For Sail
Mt. Sinai, NY
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