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Contact cleaner (better that supercheaps suff) and a toothbrush but if using on RJ12/45 I'd suggest a very soft brush to ensure not lifting/bending or damaging the contacts.
You can also spray the cleaner in and let it sit for a short period (it evaporates (the good stuff does)) and use compressed air as a cleaning assist. If it's something you can soak in a small container of the stuff it won't hurt, if not, plan B.
I've soaked CCD units (very carefully, pins only, I'm not a total idiot) in contact cleaner, CCD and entre circuit board after finding a device didn't work because of corrosion from a former owners Peltier cooling attempts. The camera didn't work and was given to me, it now works reasonably well
DO put on safety glasses if using compressed air (canned or compressor) to assist, you DO NOT want contact cleaner in your eyes. Ask me how I know.........
I am familiar with screens dying in storage but the new controller ruled that prospect out.
Bring back valves, swap enough and the old B&W TV works, till you find the blown cap or resistor or diode or......Wow, that would be a big telescope controller thinking about it, lol
My bigger problem is I can't see modern components now and it keeps getting smaller
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