"DaveC" wrote in message
...

Cleaning up an old rotary mode switch used for 5v logic levels. It has some
kind of grease in it.


€¦which has always confused me: grease is an insulator (well, the grease in
this switch is€”just tested and its infinite ohms).

I read that dielectric grease is good to keep contacts sealed against the
elements that have high physical pressure (which overcomes any separation
provided by the grease) but that signal and other low voltages grease is
contra-indicated.


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Here in the UK, Electrolube manufactures a contact grease

http://www.ebay.co.uk/itm/like/111883046769

Electrolube has been selling this for 60+ years

Hope this helps