I use both: Magic Eraser and Stylast (both the cleaner and preservative, but the preservative only occasionally). I clean the stylus after each side of the record played.
I understand that there might be some accumulation after playing even a clean record, but I agree with Stevecham that an undamaged stylus should not be covered in melted vinyl. If that was "normal," it would be a much more frequently discussed issue, which it does not seem to be. I honestly cannot say I have seen any vinyl residue on the Magic Eraser since I got my Delos in 2010.
Going back to the OP, it appears there might be some damage to the stylus, or the poor stylus has seen some nasty vinyl. The OP did not explain whether he purchased the cart used, or what history it has, so I'd start with that. In the meantime, a careful use of the Magic Eraser might help to address the problem.
I understand that there might be some accumulation after playing even a clean record, but I agree with Stevecham that an undamaged stylus should not be covered in melted vinyl. If that was "normal," it would be a much more frequently discussed issue, which it does not seem to be. I honestly cannot say I have seen any vinyl residue on the Magic Eraser since I got my Delos in 2010.
Going back to the OP, it appears there might be some damage to the stylus, or the poor stylus has seen some nasty vinyl. The OP did not explain whether he purchased the cart used, or what history it has, so I'd start with that. In the meantime, a careful use of the Magic Eraser might help to address the problem.