You can polish scratches that if you drag your fingernail over out usually but ones that catch your fingernail, you'll usually polish through the tempered layer (thin hard layer) and will end up distorting the surface so its noticable. Unless you polish the entire surface equally. It is extremely time consuming. If the slight distortion isn't a concern for you and you have the time, you can polish them up nice. Use lots of water to keep glass cool so it won't shatter from local heating, and take your time.

My personal belief is that there's a reason that many professionals wont do it anymore. Too risky, too much time.

Eastwood has a kit with abrasive disks, abrasive compound and polishing pad. Works great but teeeeedious.

There are machines that will do it quicly but expensive and I don't know how well they do on curved stuff.

Good luck.