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Cleaning inside of water tanks
I have a Pacific Seacraft 31 1997 Purchased this year.
I doubt the water tanks have been cleaned in many years. They're made of GRP and built into the boat. I do have fairly large observation holes covered in clear plexiglass. I could see some dirt at the bottom and slime on the walls when I shine a light into the tanks. Access into the tanks through these ports "should" not be a problem.
What would you recommend as a good cleaner when I scrub the tanks' insides? Also, when I need to remove this cleaning fluid and the water used to wash the tank, should I pump it directly out of the tanks. Or, is it ok to let that dirty water flow through the pipes and out the faucets? (I will sanitize the whole system with after the tanks are scrubbed/ drained)