Some times Simple Green will discolor certain plastics. For general purpose cleaning, I use Wesley's Bleeche Wite. Available at Kmart, Wal-Mart, etc., in the auto section. For circuit boards and greasy areas, buy a can of Prep-Sol. Available at any automotive paint store. If you're really serious about restoration, buy some trichloro-ethane (not to be confused with trichloro-ethylene , which is a known carcinogen.) This stuff will make a circuit board squeaky clean in no time at all, evaporates quickly, and leaves no residue. You can completely immerse a board in it without doing any damage. Just remove the covers from any relays that aren't sealed. A chemical supply house is the only place you'll find this stuff, and if it's like my supplier down here 5 gallons is the smallest amount they will sell. Definitely worth the time to hunt down. I have an old table top Delta Sonics 200W Ultrasonic Cleaner that I use for cleaning carburetors and such. Works good for circuit boards too. Bought it on Ebay for 50 bucks. Just a thought.
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