They can also be buffed or sanded to remove scratches.
All metals may eventually scratch, and many small blemishes can be easily buffed or polished away by a professional cleaning.
Scratches on the clear side can usually be filled or buffed out at least enough so that your DVD will play reasonably well.
The finer kinds, after the more shrubby or ill-grown rods, termed Ragged, have been rejected, are peeled or buffed.
If the rods are to be buffed they are immersed in large tanks of boiling water from 4 to 6 hours.