I used steel wool and WD-40.  It really works great.
VHFRadioBuff wrote:
 I have an NMO magmount which has a bit of corrosion on the threads and the part
 where the antenna makes contact. The threads of the antenna also are a bit
 corroded. Can anyone recommend a good cleaner/method to remove this corrosion?
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 Beachwood, NJ USA! Grid FM29vw
 http://vhfradiobuff.tripod.com
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