[quote=UFgator]CLR didn't work for me. It contains phosphoric and glycolic acid and didn't cut through the deep rust.
When I bought my H16 the hulls were very oxidized. They look liked they had been painted with flat paint. I couldn't wait to go sailing so I put it in and had a blast. I sailed it in north Escambia Bay which has a lot of tanic acid. Tanic icid is the dark brown stuff in mostly fresh water that is created by decomposing organic materials. Driftwood is a common cause.
Anyway, when I got home the hulls looked like they had been sitting in a bath of coffee. Tanin stains are difficult to remove if you don't know what you're doing. I heard about FSR and gave it a shot. Wow! FSR is great for organic stains.
Now the hulls are reconditioned and buffed back to a shine and no more tanin problems.
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