JimH wrote:
"sherwindu" wrote in message
...
After pulling my boat from the Root River in Racine Wisconsin, I noticed
that
there
was an ugly band of black gunk at the waterline, especially at the
upstream side
of
the boat when it was in the slip. A power wash got the mud off, but this
band
of
gunk stayed on. I had the same problem last year, and had to rub like
hell with

all kinds of cleaners to get it off. Someone recommended using Tidy Bowl
as a
cleaner, possibly because it contains Muratic Acid. I know that Muratic
Acid is

used to clean and etch concrete, so I was wary to use it on my fiberglass
hull.
Was I correct about this? Is there a better way to clean off this river
junk?
I
have used Zud and other similar products, but they don't get everything
off and
require a lot of elbow grease. Some of this gunk is on the bottom paint,
as
well,
so I have to be careful not to dissolve that.

Sherwin


Bar Keepers Friend
http://yhst-55367440605114.stores.ya...barkefrpo.html



I would not use Bar Keepers friend or any of the other abrasive cleaners
on fiberglass, while it is a mild abrasive, I would be concerned it
would just make it harder to remove the gunk next year.