I used fingernail polish remover. Enamel reducer, Prepsol, and items like that should work too.
The tape you received is TWO sided tape. Once the glue is cleaned off the GPS, remove the paper backing and apply the tape to the GPS. Then carefully remove the outer plastic from the tape around the GPS. It looks like it's 1 piece, but once the plastic is removed, it will leave a very thin piece of 2 sided tape, with 1 side stuck to the GPS. Then slip the rubber "band" around the GPS and align correctly before pressing everything in place.
Rich
Darn! Just spoke to the folks at Garmin and they won't sell the parts to me saying it has to be sent in.. Original Garmin Legend. For 80 bucks, it's just not worth sending in. For the same price I can get a Venture HC refurb or new for a bit more. I wish GPS' were like cell phones where they sold aftermarket shells.