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Q.
What Can I Use to Clean Motors, Contacts, Relays and Potentiometers?
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A.
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Contact cleaners are very popular general purpose cleaners. They need to dry fast, be nonconductive, be safe on plastics, be nonflammable, and have great toxicity ratings. Why do we need such a special solvent for contact cleaning? Because of the demanding nature of the application. 
The problem is that contact cleaners are often sprayed onto electrical circuits that are electrically energized (NOTE: This is NOT a recommended procedure.). If you spray a flammable solvent every circuit, relay and switch then becomes a potential source of ignition. It is vital -- for worker safety as well as to protect the machinery -- that a proper and safe solvent is used for real contact cleaning applications.
It is possible, for example, to use a flammable contact cleaner on a machine that has been powered down for maintenance. However, if that system is then powered back on before every drop of solvent has evaporated, you can have "flashback" situations as a spark from a relay or a switch ignites the oxygen-enriched flammable fumes around the machine.
So stick with the nonflammable contact cleaners, especially if you are cleaning motors or electrically energized circuits.
Updated 5-19-2005
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