I don't have experience with that exact switch/module you are talking about, however I can tell you that in manufacture, electronics are often washed and dried with water. Of course you would want the module out of the car and disconnected from electricity to do this! I think the problem you have is residual water or residual sugar/residue or both. The spray solvent mentioned can work and has the advantage that it evaporates readily, however has the disadvantage that it is expensive and not great for the environment. So if you can remove the thing and give it a good wash and a THOROUGH dry that might work.

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