You might try to use a headlight restore kit. I have not tried it on colored panels but it works very well on plexiglass. Don't see why it wouldn't work on the colored panels. You rig does look good though.
Thanks! A few tips I discovered while working with this plastic: I first tried Meguiar's Polish (works great on paint but did nothing to remove scratches from plastic) Then I tried rubbing compound - BIG mistake! The body panels are vinyl - one of the softest plastics, but also strong and flexible. Rubbing compound is great on paint and harder plastics like acrylic, lexan and plexiglass, but it is too coarse for vinyl - scratched it up pretty bad! A headlight restore kit may cause the same initial damage with it's rubbing compound. I ordered a vinyl restoration kit from Micro Surface Finishing Products Inc:
Liquid 8 ounce 5 Pack Special -MICRO-SURFACE FINISHING PRODUCTS, INC
They also have a full vinyl restoration kit called Clear-Seas which includes foam pads, etc. for a cordless drill, but at twice the cost, with half the polish!
Clear Seas Vinyl Restoration Kit -MICRO-SURFACE FINISHING PRODUCTS, INC
So I bought a variable speed Simoniz angle buffer-sander with a 7" foam backed disk and cotton bonnets. Micro-Mesh makes pads and sandpaper available through the whole range 300-10,000 grit, but it is expensive. Through trial and error, I discovered that Mr. Clean Magic Erasers are where you want to start, with scratch removal from vinyl (I figure they are around 3000 grit) Use them wet and sand the damaged area to a uniform dull finish. Then start with the buffer on low speed (500-1000 rpm) and the #5 abrasive polish (5 micron) Keep the disk moving in 3" strips and use water mist to control heat and buffer speed when the polish begins to dry and the buffer slows down. Patience in the name of the game! Every 10-15 minutes wash it all off with clean water, inspect and start again. Eventually you will see a dull shine start to appear (you'll use more #5 polish that anything else in the kit) Once the scratches from the Mr. Clean Magic Eraser are all gone, wash out the bonnet and foam pad and switch to the blue label #1 abrasive polish (1 micron) This will go much faster and you will see a good shine appear on the vinyl. Wash and dry, then apply a coat of Micro-Finish polish by hand. The Final-Finish is a vinyl restorer and can be used instead Micro-Finish if the vinyl is sun damaged. Use the same procedure on a plastic windscreen, plus a final coat of Anti-Static Crème so it won't attract dust.
Sorry for the long winded explanation, but this stuff really works on vinyl! I guess one could save time by buying new panels from Honda.... but I'm retired (have the time but no money!
The moral of the story is don't use plastic tarps when transporting your Pioneer! Now out to the woods and put some real scratches in it!