"Jerry G." wrote in message
...
You should get a proper rated contact cleaner. See your local electronics
parts supplier for a recommendation. There are a number of these on the
market. We use Neutrol. We only use it if there is a problem. Avoid
getting
this on the general components, or on the circuit traces. All liquids,
material, and or cleaners have some reactive properties, and when covering
sensitive circuits, it may change some characteristics.

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It's a good idea to blow it out with compressed air once you spray the
cleaner on, that helps get residue out of nooks and crannies.