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A headlight polishing kit from an automotive store is a good place to start.
I use my dremel with a foam circle cut from an automotive polishing pad and the automotive polishing compound. The trick is not to linger polishing one spot for too long, just short quick passes at a moderate speed. Too fast or too long spend in one spot can heat up the plastic and scorch it.
If there's deeper scratches, use sand paper first to remove the scratches and then polish it. Work from a low grit to a high grit, the highest you can buy (again, look to automotive stores, as they sell grits higher than what you can get in hardware stores). Use as high of a grit (large number, smoother paper) as you can, if you use something too rough you'll put even deeper scratches in to it which will also have to be removed.
If it's overly yellowed though, you might just have to replace the part.
oadie wrote: Whatever abrasive means you might use, I'd recommend applying a final gloss product to finish it off. A gloss spray might work, but I swear by the Future/Klear/PFC (the acrylic floor polish) dip. Airplane and car modelers have been using it for years on clear parts, even right off the sprue, to enhance shine and clarity, making parts appear more like actual glass, in scale. There are articles online about if, if you want more info.
I think that comes down to personal preference, I reckon "glass" looks best when it's well polished, but not dipped in Future. The floor polish gives it a look that doesn't look scaled glass-like to my eye.
But everyone is entitled to their opinion. I prefer well polished but not dipped, others rave about the floor polish
Either way, if you do want that gloss look, I don't recommend a gloss spray as it's almost impossible to avoid some level of either graininess or orange peel which is very noticeable on clear parts, the acrylic floor polish self levels itself in a way gloss spray does not.
I forgot to mention in my previous post, Tamiya polishing compounds also work great for polishing canopies, but they're not cheap. They make 3 of them, coarse, fine and finish. If you're doing what I said (using a dremel with a foam pad) then you probably just need 1 or 2 of the compounds.
I was watching a video of someone doing a car model, if you fast forward to 17:00, he polishes the paintwork of the car in a very similar way to how I polish my canopies, but he uses cotton polishing pads. Maybe his polishing pads are different, I found the dremel ones too harsh which is why I swapped to foam ones (which I cut myself from larger automotive polishing pads). Notice that he starts polishing by hand but eventually gives up and swaps to a rotary tool It's definitely possible to do it by hand if you don't have a dremel (or similar), just a lot more work.
It's definitely possible to do it by hand if you don't have a dremel (or similar), just a lot more work.