Here is a tip that would make your gadgets sport that sparky clean just-out-factory look all year long. Well, here is trade secret(Yeah Duh!) that I was able to wean out of the computer service guys, they use a solution known as Isopropyl Alcohol (Isopropanol) to clean the components. The bottle in the picture can be brought from the chemists shops that supplies lab chemicals.
Alternatively you can use some rubbing alcohol which actually 70% Isopropyl mixed with some water. I think medical stores do stock rubbing alcohol, but be sure to double check the label. Also read this post mention Hexane is a good choice too.