On Sun, 28 Oct 2007 20:52:10 GMT, Short Wave Sportfishing
wrote:

I use a brush with a liquid oxalic acid solution. Removes those stains
for me. The most annoying stains I seem to encounter on the hull are
those left behind by the tannin in the water.

I've always used Soft Scrub - non bleach, non scented.

Works and not a lot of "elbow grease".

On and Off is quicker and requires almost no rubbing. It is much
easier on fiberglass than Soft Scrub. Wear eye protection and old
clothes.

Sno Bowl works just as well and is cheaper, same ingredients
basically.