"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).

When I worked for a calibration firm, they had special contacts grease for
the old decade boxes. AFAICR: it was called Elvolube - but I haven't been
able to find it online.

Often I use GT85 - its like WD40 but PTFE enhanced, it doesn't interfere
with contacts but the solvent destroys any ABS plastics in anything you
spray it on.