Is it any way to buff up plastic scales?

I have just picked up a kramerso from a flee market with warped scales that i fixed in the same way as i have fixed warped Vinyl records, with a bot of sun and heavy pressure.

One of them is a bit white one so my question is: Are that any way to buff up plastic scales?

You could try a metal or aluminum polish such as Mothers..it's what I use. Or there's even the stuff for cleaning car headlight lenses that works as well.