Go to Focus and buy a bottle of sticky stuff remover £4.85 a bottle.
this stuff works a treat, I have just done 3 small town houses today (sunday) I run out of my usual stuff and needed to remove the sticky stuff from the film sheet they had on the windows, went into focus and found this bottle of sticky stuff remover, apply to cloth and rub off.
Some labels are water based and only need water to remove, but go prepared.