I also agree that it looks like a scratch. Polishing it is your best bet. Also on the outside of the glass means someone did that. You may want to round everyone up and ask what happened.
haha round everyone up thats just me my wife could care less hahahahaha Im totally at fault here i guess. I have to assume it was from the glass cleaner magnet.
I probably wont worry about buffing it out you cant really see it unless you have a flashlight up to it.....well at least that how it was until now now that i know lol
I hear buffing could be a pain i may just leave it