i flipped my old 300ex and used 220 on a orbital sander, then handsanded with a 320 paper and then again with a lightweight oil. final step was 4/0 steel wool and oil. you can use any oil, I'll use vegetable oil so it cleans up easily with water. It's elbow grease so determine how much time vs cost you want to spend. also, buff it with a cloth only(don't use electric) with a mequiers plastic cleaner. Let me know if you have any problems.

 

I haven't tried this myself, but will. I always use "Meguiare's Mirror Glaze" on my vehicles. It is a liquid compound (contains varying degrees of grit). The bottles are numbered and I think the lowest number is the finest grit or vise versa. The labeling on the bottle also informs you of what type scratch it will effectively take out. Their website address is: http://www.meguiars.com/
Go there then look for Clear Plastic Care. I am sure it will work with a lot less elbow grease. I am not sure where you are from, but on the East Coast--Track Auto handles their product. Good luck.

 

I have used the STP son of a gun & it helps hide the scratches.

 

Like Johnsen, I don't want to hide my scratches; I want them gone. I want a permanent fix until I scratch it again. I don't want to have to deal with wiping some cover up scratch remedy on every time I wash my quad. The "Mirror Glaze" is as simple as waxing. You wipe in on, let it dry, and then wipe it off…no more scratches. Again, I haven't tried it yet, but will buy it and try it out the next time I see it. I don’t believe it will take out deep scratches, but am sure it will probably take out surface scratches.

 

I did an entire '87 yamaha that was so bad, it looked white. The actual color was blue. I too sanded it, first with 80, then 220, then 400 grit. But I think the key is to wet sand it. Hold the hose with just a trickle right over the area that you are sanding. This carries away the plastic that you are removing to keep it from balling up and making new scratches. It also makes the paper last longer. Once the whole quad was smooth, and all the oxidation and scratches were gone, then I used some generic plastic polish, like $3 at Auto zone. It looks brand new. I have heard of other people doing it too, so I didn't make this one up on my own. Good luck.

 

I used to use a product called "Wesley's Bleach White" to clean my plastic. The stuff cleans & shines SO well, you will not be distracted by scratches. Pep Boys sells the stuff. Use it in a hidden area first. I once used it to clean the dash in my pick up, and it ate the chrome paint off the trim!

Another great plastic cleaner is "Castrol Super Clean"