I had an epiphany just the other day. I bought a Dremel, a small motorized rotary tool, a few months back and hadn’t really used it until recently. I noticed there were cloth, polishing attachments so I decided to see if I could buff out any scratches on a vintage, stainless steel watch I have. I hadn’t read anything about this, it was just an experiment. Within seconds the scratches were gone! I then moved on to the scratched crystal, and those came out too, though with much more polishing. I also found out that it does work on acrylic as well, but one needs to be very careful. FYI, the iPod screens are ACRYLIC, not glass. I found out the hard way and melted a small pit into it.