I use an alcohol solution and some q-tips to rub off any dirt from the game heads. It seems to do the trick rather well, but I was just curious as to how other people may clean their games.

That's what I use.  It seems to work really well.  I'm open to other ideas though.  What do you use to get marker and stickers off of games?

Goo Gone for stickers, fire for permanent markers. :P

Alcohol & Q-tips are now the official NES cleaning kits. :D

for marker and goo I use contact cement remover. It doe the job rather well, keep it away from the cart labels though.

To rid yourself of marker, sticker, residue, and such I used Mr. Clean Magic Eraser, it works real well. You can also use it on the labels without damaging them but you have to be careful and go slow and smooth.

If you have a security bit and can open them , using a regular pencil eraser on them makes them look like new. (unless they are really, really bad and green looking) this tip works for most electrical contacts and switches too.