CRC has an aerosol product called QD that seems every bit as good as or better than the tuner cleaner that I bought at Radio Shack and used for all kinds of tune up work on everything that used electrical contacts of any kind including the power connections.
I ran out of the Radio Shack product long ago and gave up on ever seeing it again then I saw this product and gave it a try. My first try was a digital VOM that needed several on-off efforts to get it on and once on the selector had dead spots and the display had faded spots. I shot everything in the housing generously and then blew it ought with light air pressure and found that it was back like new. Next I pulled the cover off of a radio remote and cleaned it with success.
Long ago when EFI was just becoming popular a mechanically operated potentiometer was used to measure mass air flow and they had a tendency to develop a dead spot at normal cruise speed. The part was expensive and rarely in stock anywhere but the dealership where they were astronomically expensive so I experimented and found that cleaning the sweeping contact system and then lubricating it with electronic grease improved the situation considerably and kept the customer somewhat happy while I chased down a replacement part at a reasonable price. Several European cars used a contact in that MAF to turn on the fuel pump and cleaning always corrected that problem which saved customers $2,000.
Anyway, I now wish I had not thrown out several radios and a CD player and quite a few other odd devices that would likely still operate if cleaned.
And BTW, I have no interest at all in that product.