The best way is to get: a paper towel or something like it, baking soda/powder, and some cleaning product like windex/dish soap/even soapy water I guess, and a razorblade. 1st take off what you can of the sticker with the razorblade, then if there is that annoying residue left, get the paper towel, and put a bit of the cleaning product stuff (whatever you decided to use) on the paper towel, and put a small bit of baking soda/powder on the spot where you put the cleaning product. Then just rub it on the sticker residue and it should be gone within seconds, then wipe it off. What happens is the baking soda acts kind of like sandpaper, except it doesn't ruin the metal because it is only strong enough to take off the sticker residue. Sorry for making this a little long winded lol, but it works really well and you don't risk scratching anything up, and you don't have to buy some wierd stuff for removing stickers from a drug store.