I looked at this a while ago and watched some videos (YouTube). Plenty of vids to watch and resources for this.
I declined to try, since many of the pits after 20 years of "highway sand blasting" were pretty deep. I didn't think these could be polished out.
It's quite labor intensive, but I suppose worth a try. The only thing you have to lose is your time and the cost of the kits/polish/pads.
I decided a new windshield was a better option for me. So, my car is on windshield #3.