In article om,
says...
The rumors were true! There really was a boat under all that dirt.
The water has been off at my slip since October, so today's project was
to motor over to the guest dock and scrub (for 4 hours) her clean.

I stopped and purchased a bottle of Meguire's "Gold Seal" car wash
soap. ($7.99). I've had it with paying $30 a gallon for so-called boat
soap at Big Box Marine- only be disappointed with the results.

This Meguires stuff is so concentrated that it pours like molasses.
I used half a bottle on my very dirty 36-footer, and the boat hasn't
been so clean in a long time.

If you're looking for a good boat soap, the answer may not be a "boat
soap" at all. :-)

Another in the line of efficient products is call Rolloff. It's made by
Bell Chemicals and sold by Boatersworld. Floats dirt and build up off
more effectively than anything I've tried.

I have a oxidized blue stripe and this stuff (in it's most diluted form)
washes it away immediately (I've got to repaint the damn thing). Pretty
effective on black streaks too but not quite as much as the black streak
remover.

Sold in gallons for under $20 and a bucket of soapy water takes about a
cup if I remember correctly.

Here's a link. Very satisfied, no connection.

http://www.boatersworld.com/webapp/w...roductDisplay?
storeId=10051&catalogId=10051&langId=-1&productId=13219908