Any cleaner with Oxalic Acid in it. It's amazing stuff. Be sure to use
rubber gloves.


"Annette & LJ Dumas" wrote in
message ...
Hi, gang.

Have an '86 Bayliner with its original (though Frankenstein'd) Force 50.
Been in the water all spring and summer (freshwater lake). Has usual
algae-like gunk on hull, but also a hard dark brown scale-like substance
all
over. Anyone have a secret for cleaning this stuff off, short of a
blowtorch?

TIA

Joe