I have always been suspicious of this stuff. I mean spray "contact cleaners" in general. Generally when connectors go bad it is due to oxidation or physical wear. I have tried "contact cleaners" a few times and they have never done anything for me. I have had good luck with silicone grease/dielectric grease on some connections to keep water out. I would not recommend it on lamp sockets since the heat would cause it to leave the area I imagine. I am curious what the problem is that you are trying to cure. If you find one of these products really works let me know. I have never tried the CRC product but the write up I saw for it says it "flushes away grease, oil, dirt" These are not the problems with connectors in my experience.

Mike

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra