If its just a normal plastic backed sane sticker that peels of in one go i normaly just let any small amount of resedue just get removed by palm oil if its a morden laptop. If its a older one i just use some normal ipa and just wipe it of with a bit of elbo grease and it usualy is just fine.

If its a paper back one I normaly let them soak in ipa for them to start to get desolved and use a spudgure to get most of it of and then a damp cloth.

But most of the time stickers normaly just peel off