Ok so I have the 2011 model RDX & these headlights are pretty bad. I did get them polished up about 2 years ago & they are really bad again.
I seen online that they sell the clear lens for a few different vehicles but I haven't found anything for the RDX.
There are how to videos on how to do this with the other vehicles for which they still these new lenses so not that hard to swap out & silicone then back together.
Has anyone did this before or know where to buy just the new aftermarket lens?

 

After polishing, did you protect the lens at all? Either PPF or re-clearcoating

 

Definitely have to do some sort of protective coating. Some kits polish it up real nice but do not offer any kind of clear coat or protectant to apply once done. Without that, you're looking at a year or two before it's all oxidized again. I used this one last year - it worked great and hopefully the ceramic coating it comes with keeps things nice for longer.

https://smile.amazon.com/gp/product/B084RQKLV8/

 

After cleaning and polishing, try putting 3M clear PPF. It will prevent yellowing from all the UV rays. Or you can use clear coat, try putting 3M 39173 clear coat wipes after polishing. In my opinion clear PPF is the best way.

 

I agree with the paint protection film. The last 2 new cars I bought I had the film added and they stayed clear.