(The following link has been fixed and is working)
How to remove scratches on plexiglass...

I dare you to try this on your new $500 BMW windshield!!

As a matter of fact, my brother tried it and..... IT WORKS!

Bert

I have actually done this on a perspex aircraft canopy with a reasonable degree of success. The key word is PERSPEX. Try it on any other type of clear plastic and the results may not be as encouraging.

Phil

THIS WORKS!!!!

But it may take a bit more work than you expect

Check out the before and after pix

I tried it out on my 20+ year old RT windscreen which was overdue for replacement so i thought i would give it a try, had nothing to lose right? It was so bad that i couldn't even see through it. but i I liked the little diffuser thing on top and didn't want to lose that so I pulled out all my wet sanding sheets and some polish and set to work

this is what the screen looked like beforehand
apologies for the pic quality but if you squint you can see how yellow the screen is... You can see the lower section of the screen had a sticker and has been protected from the weather so you have that for a contrast to the rest of the screen. This pic was taken fresh after a wash too. There were some pretty deep scratches in it, seriously i had my doubts

THIS IS THE FINISHED WORK!!!

Here is what i did.

Started with the 600 grit wet and dry and rubbed it down with water for about 2-3 hours until all the yellow stains were gone, then 1200 grit in the opposite direction until all the sanding lines from the 600 were gone, then 1800 using same procedure, then the 2500 grit, and finally the polish using a drill and buffer.

I had my doubts when i pulled out the polish as the screen was worse than before but i polished and polished that thing for hours, batteries on my drill had to be recharged a couple of times but luckily i have a spare, anyway slowly slowly like a foggy morning it got better and better until it was about 99% visibility... good enough for me

all up i reckon this took approx 12 hours to get my crappy screen from garbage to good. If i knew how good the screen would have finished up i would have taken plenty of pics to show you the full process but like i said... i had my doubts

viney wrote:

THIS IS THE FINISHED WORK!!!

Here is what i did.

Started with the 600 grit wet and dry and rubbed it down with water for about 2-3 hours until all the yellow stains were gone, then 1200 grit in the opposite direction until all the sanding lines from the 600 were gone, then 1800 using same procedure, then the 2500 grit, and finally the polish using a drill and buffer.

I had my doubts when i pulled out the polish as the screen was worse than before but i polished and polished that thing for hours, batteries on my drill had to be recharged a couple of times but luckily i have a spare, anyway slowly slowly like a foggy morning it got better and better until it was about 99% visibility... good enough for me

all up i reckon this took approx 12 hours to get my crappy screen from garbage to good. If i knew how good the screen would have finished up i would have taken plenty of pics to show you the full process but like i said... i had my doubts

you are a very patient man... very admirable!