After doing one panel of a Beocenter 9500 by wiping the old tape with isopropyl alcohol and getting into a right old sticky black mess, I did the next one by sticking it in hand hot water with Fairy Liquid, leaving it to soak for 15 mins then the old tape and goo will come off with just gentle rubbing with the end of your finger.
Soooooooo much easier, quicker and cleaner!
Cheers
Nigel