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[ltank]

I have a old windshield that has what looks like oxidation on both sides. I can scrape most of it off with my thumb nail but that would take forever. Should I wet sand it with 2000 0r 3000 grit paper then get polishing compound in a drill and buff it?
Or use a headlight restoration kit? Once cleaned up what the best way to keep it looking good?
Thanks

[OBB]

If its old and oxidizing, I'd be leery that its still safe. It could be brittle and shatter even if it took a small pebble.

[Rimjam]

Use it for the pattern for a new one.

[mark]

You could get a kit that's designed for headlight restoration and try that. 

[D-N-D]

Try Toothpaste on it

[deldago]

It may be a coating that was applied. I had one do that and after contacting the manufacturer it was determined that it was an anti scratch coating that was coming off. Had to replace it.

[GregKhougaz]

Can't say what to do with your old shield but there a various resto kits for plastic.  Best plastic cleaner / polish:   Plexus

[ltank]

I can scrape the white film on each side little by little with my thumb nail. I will try wet sanding with 2000 then 3000 grit paper.
I also bought a kit from  Amazon some Novus. It may take a couple of hours but it's the principal. The frame work and mounts are fine. I looked at National and Memphis replacements in case I screw it up and make it worse.
Thanks guys

[ltank]

I wet sanded the windshield with 1200 then 2000 grit sandpaper
Then polished it. I screwed up and the drill chuck scratched it in a few places, so I had to wet sand it again in a few spots. As you can see I have to rebuff it in a few places.