De-Natured Alcohol works the best on cd's. You cant use it on labels on carts because it will make them fade ( you can ude it on the cart itself).. But on a cd or a cd case, peel off most of the sticker by hand and fingernail. Then put some denatured alcohol on the left over residue and rub it with your finger until you can't feel it anymore and then wipe with a clean cloth. This will not hurt either side of the cd or case. I've done it a hundred times. Oh by the way get it at lowes or home depot for about $4 a bottle.