Some of you may already know about this stuff, or have something you've used, but I thought I'd share anyway.
I got tired of not being able to see my gauges through the lenses because they were so scuffed up and sun-damaged. Especially at night, the light actually lit up the lense itself and it was like looking through a glowing fog.
I tried windex and armor-all and such, to no avail, but then a friend of mine told me about this stuff that he used on his boat windshield, so I bought some and look how well it worked! I love it! Now all I have to do is get my led lights in and they'll be perfect!
Before:


And after:
