I tried elbow grease and Simple Green and it seems to take the stuff off
-- but not without a bit of an effort.
I bought some of the hull stain remover that Ted Duke recommended (On
and Off) and it sure cleans up the residual stains after the algae is
removed. Nasty stuff -- with some chemical fumes that even a
non-chemist like myself know should be avoided.
Next year I will paint the bottom and, hopefully, this won't be such a
problem.
I cleaned off a substantial area and haven't noticed any of the
blistering that Ted saw on his 1990 potter so I consider myself lucky.
The weather out here in the DC area has done its usual flip over from
the dog days of August to the splendid weather that attracted us to DC
in the first place (Wisconsin winters helped too). Summers here are
awful, but the falls and springs are long and almost always pleasant.
Two weeks ago we were sweltering and had to keep the air conditioning on
all the time. Now the days are in the 70s and the nights are getting
down into the 50s -- and the breeze is up! Whoopie!
Regards
Rye Gewalt