I got one of those little glass polishing kits from JC Whitney
glass polisher/scratch removal All you need is an adjustable speed drill and you're ready.
I had several small scratches on the inside of my windshield from trying to get stickers of of it with a nicked razor blade.
I used this removal system. It took about an hour, but it worked really well. How deep are the scratches? Mine were light enough so that you couldn't feel them. But they were right in front of my face and really annoying when driving. I can still see it faintly in the right light, but it's
much better than before.
It may have taken me so long to buff it out because it was on the inside of the truck near the steering wheel, so it was awkward...but if yours is on the outside it may be easier, good luck!
If you can feel the scracth this probably won't work though, you may need to take it to a pro...