I tried debugging one of my new V4's and it's stuck in hyper-mode. As in, EVERYTHING happens at hyper. You can't just switch back and forth between normal and fast. So I would suggest perhaps you shouldn't, as I think my Tama is essentially ruined now.
But all the other versions I've debugged...
You could try rubbing alcohol or (as weird as it sounds) a little bit of peanut butter. My parents use both for stuff like that. Just keep a damp cloth on hand if you try the PB, to wipe it off with and to make sure the Tama doesn't get all oily. The rubbing alcohol evaporates quickly; don't use...