As Doug said - use a wire brush in a drill.
Once done - get some galvanize spray (from Lowes or wherever) and spray the
anchor again to keep it from rusting.

--
Tony
my boats and cars at http://t.thomas.home.mchsi.com

-
"William Andersen" wrote in message
news:HUWve.774$HV1.649@fed1read07...
Any ideas on cleaning an anchor?
My spare anchor, a small Danforth type, has never been used but is
corroded. Probably from getting wet at the wash rack, I'm a trailer
boater. I tried using my wife's Black & Decker Mouse with an abrasive pad
but it was pretty ineffective. I'm thinking of buying a 4 1/2" angle
grinder - I could probably find other uses for it around the garage.