My Peekabook Frames die got a workout last month, and it shows!
If I had a lint roller, that would get rid of all that schmutz, but I don’t. What I do have is plenty of packing tape and so I make my own roller. Just cut a length of packing tape and stick it into a loop, sticky side out. Slip your hand through it:
Allowing the tape to roll freely, rub your hand back and forth over the die — or sweatshirt, or tablecloth, or slipcover, or whatever is linty! Use the “lint loop” until it stops picking up stuff. Then make a new one!