All of my MR sabers with the T-track grips have this problem from one degree or another. I just tried SurferGeek's solution on a 2005 Anakin ROTS and it worked like a charm. I then immediately tried it on a 2007 Luke ANH, and it's not working like a charm. You would think the older saber would be harder to clean, but it seems there are factors other than age at work. My advice is to make sure you've really got the bulk of the gunk off, using adhesive remover and a rag or even scraping it off with some kind of plastic tool, before you use the melamine sponge. Don't try to rub with the sponge too hard, or it will disintegrate in the blink of an eye. Just wipe outback and forth, lightly. If the stickiness isn't going away, that means there's too much gunk remaining, so go back to the adhesive remover and scraping. It's hard work! I have my doubts about applying a sealant afterwards. Wouldn't a new coat of gunk just form again under the sealant? If we knew more about what triggers the breakdown, we would have a better idea how to deal with it. It's amazing that MR didn't check into the durability of this material before using it, and that they continued to use it till the very end. I really hope Hasbro is using a different material.