I don't know if any of you have used them, but those moist 'Baby Wipes' are perfect for removing dirt, price tags, stickers etc. from the exterior of consoles and cartridges.
Whatever chemicals are in them, they get rid of stickers, and sticker residue with ease - without eating into the plastic. I find stuff such as window cleaner to be quite harsh to plastic.
If you're careful, you can also use these wipes to clean CDs!