On Sun, 09 Sep 2007 11:20:40 GMT, "Frank Dresser"
wrote:


My last resort cleaner on brass contacts is Tarn-X. I like to work on old
radios, and 50 years of age and bad storage can create a corrosion seemingly
immune to even the best cleaners. I suppose the cleaners are doing their
job, but there's such a bulk of oxidation on the contacts that normal wiping
action is often breaking off a new piece of grunge to foul the contact yet
again. Tarn-X does a good job of stripping off these oxides, but I fear
that stuff will be wicked up into the cloth backing of the Bakelite contact
holders and might cause conduction/corrosion problems later, so I give them
a good water soaking afterwards followed with plenty of alcohol then CRC QD
and DeOxit. I've only had to do this a couple of times and it's worked
well.

Non sudsing ammonia.