Alright as the title suggest. How do you clean your games, what do you use, and what are your preferences?
For disc based games, I just use the same clothe used for cleaning glasses. Since there free where I live, I stock up on them. I just give the disc a wipe over, removing any dust or finger prints. If the disc is particularly dirty, I'll fill up a small bowl of COLD water, let the disc sit for a bit, then let it sit on kitchen paper for about 5 - 10 seconds, and when all the excess water is gone, use the same method as previously mentioned. Provides scratch free cleaning.
For cases, I tend to use good old window cleaner. Makes them feel as good as new, but if there's any stickers or sticker residue, I use a que tip and a bit of oil, saturate the sticker/residue, let it sit for 5-10 minutes, then wipe it off. It usually comes off in one fair swoop and has no ill affects. I obviously go over it with windows cleaner after to get rid of any traces of oil left.
For cartridge based games, well that's when its gets odd. I have different methods for different cartridges.
For all games, I clean the contacts and the area around the contacts with WD40 and window cleaner. I take the cartridge apart, then using the window cleaner, clean around the contact area were dust generally and dirt generally likes to settle. For the contacts I use good old WD40, it doesn't provide as good of a clean as rubbing alcohol, but I find that it provides assurance and games don't need to be cleaned as often. I wipe off all excess WD40 with the same type of clothe as I use to clean discs. I might start using rubbing alcohol and WD40 together, as in give it a good clean with rubbing alcohol first, then provide a coat of WD40 after.
For cleaning mega drive cartridges, I generally use a damp tooth brush to get rid of any dirt stuck in hard to reach places, then go over the cartridge with WD40. Doesn't hurt the label, but provides a *like new* shine to the cartridge and label. I wipe all excess WD40 off.
For NES, SNES, and N64 games, I haven't really got a decent method for cleaning the cartridge, as I'm not sure what chemicals may react badly with the gray plastic, though I have been looking at Wiggy's videos, and might start using the same method as him for NES, SNES, and N64 games.
So how do you guys and gals clean your games?