x-winguk

One other thing to try first is to carefully use the point of a sharp craft knife to gently 'flick' off the old number from a corner. I would advise against using Acetone as it just loves to melt plastics, personally I have been using 'Meths' and a cotton bud for years and 'T-Cut' is also good I find. but whatever you use just be gentle and cautious. Rgds, Chris B.