Cleaning yellowing protector

Hello, I am not sure what it is called, but it's the clear film on the rear fender just after the cab and in the rear at the bottom of the fender.

My truck is white and the film is yellowing.

What's the best way to clean it to get it as close to white/clear as possible?

Thanks,

Steve

 

Only way to fix it is to replace it.

 

Thank you. Would the replacement be #25 and #26 here?:

https://parts.olathetoyota.com/auto...ngine/body-cat/exterior-trim-pick-up-box-scat

 

You can also buy rolls of paint protection film and cut the pieces yourself. Here are two examples from Amazon.

 

Great idea. I had no idea about this stuff.