Really.wow .sorry to hear that... . I have always had good luck removing the sticky loca from the digitizers. I have also used rubbing alcohol. I actually got the tip off a YouTube channel.... I am glad it worked out
The WD40 did make it non-sticky and basically turned it into a rubber-cement-like gel. I scratched a bunch of the goo off, but I wasn't going to get all the gunk off of it without a razor blade and a lot of time (and I probably would have managed to scratch the hell out of it in the process, knowing my luck, lol).