plexiglass sub box scratch removal and polish

I have a bandpass sub bow and it has two plexiglass pieces.
 
What can I use to remove the scratches from the plexiglass? I already tried the meguiars plastX cleaner and polish and nothing.
 
Any ideas?

Maybe you're not putting enough elbow grease into that Meguiars. I have wet sanded my headlights and tails and then used that to polish them and they came out crystal clear.

replace it plexiglass is cheap home depo. besides sealed encloser is way better more bass.....