Most folks around here use On & Off to remove brown scum.

"Rick" wrote in message
...
After a beaching with Katrina and the refloating with Rita I am left with
a boat with a brown scum smile on the side of the boat. The residue is
from mud mixed with oil and diesel from the sunken boats that were not so
lucky.

Question is cleaning the hull? My thoughts are open at the present time
and am wondering if the groups experience base can help? Right now the
boat is in the boat yard so access is fairly easy.