Cleaning up thru hull fittings

[Akapeterc]

What is the best way to clean up the green on Brass fittings

[JPA Cate]

If it's brass and not bronze, replace it with bronze. The brass fittings have a very poor reliability record.

Ann

[Akapeterc]

I will have to check, they could be bronze

[HopCar]

Almost any acid based cleaner will take the green off. If you're spending time in that area, you might consider a structural improvement. I'd replace that wood backer block with a piece of fiberglass and I'd put a Groco Flanged Adapter between the thru-hull and the ball valve. Make sure it's a good ball valve while you're at it.

Groco Flanged Adapter IBVF