Levin Letter Box Grille Restore!

[JDM-086]

I have a Levin letterbox grille (non foglight type with plastic face)


As you can see in the pic slightly, the clear is off in some areas and looking somewhat....shit and dull
I have tried the following:
-autosol
-plasticX meguires

Basically i want to try and restore it to the new CLEAR fresh look again.
Was wondering if anyone has had any experience/suggestion with this particular task/item?

I have researched some methods and so far it looks like this is the best way,
but is still a gamble because most plastics are generally different.
(does anyone know what type of plastic is actually used for this?)

-sand it, gradually with finer grit papers (1200/1500/2000/3000)
-use a fine cutting compound
-use toothpaste
-use a plastic polish/wax
-if still not 100% clear, spray with acrylic clear


Please don't post comments like "buy a new one" or "get a foglight grille"
Id like to assess this option first and then I'll make a decision.