UPDATE:
I ended up using Griots' Garage Complete Compound on a 3 inch pad attached to a drill as was suggested too me.
This worked very well and didn't take that long. I still have to do some areas by hand on the lower part of the windshield because I didn't want to damage the wiper arms or seal with the drill.
I did the side glass as well and in one of the pictures I did a 50/50 before and after.
Another suggestion was made to use shop towels soaked in vinegar and lay them on the windshield. I wanted to try that method but the towels have to be kept wet and would require spraying them every few hours with more vinegar too keep them wet.
This may have worked and would have been the most cost efficient method. Because I am caring for my father I didn't have the time to try this method.
I thank you all for the help and great suggestions!



This what it looked like originally.

Another picture after multiple attempts of different methods.

After using polishing compound. Still needs some touch ups by hand. Inside glass needs to be cleaned with glass cleaner.

The white spots are the "sling" from the compound coming off of the pad. It looks so much better than before!

50/50 of the driver's side window. What a difference!

This is the compound that I used. It was about $13.00 on amazon.