>>>1) What do you use to get cone marks off the Starshield? What a bitch! <<<
Mostly I have hit cones with the side sills in front of the rear wheels. First I try bug and tar remover along with a cleaner wax. That worked well at that Aberdeen event and I did it right there on the spot. If they are pretty serious marks the aforementioned won't work. In that case I have used Gojo citrus cleaner with pumice. That absolutely, positively will get the marks off but may dull the surface of the film. But try milder stuff first and go more aggressive only as required.
Some also suggest using that mildy abrasive sponge whose name I forget but that is sold in food stores...magic something. I tried it and it was pretty slow going. You can bring any surface dulling back to life with some wax though. The side film looks like it will be something to replace from time to time. Kicked up rocks can cut right through it!
>>>2) What did you say you applied to the plastic vents to make them all shiny and black? <<<
Plexus plastic cleaner and polish. Boating and motorcycle places carry it. Some airplane places too. It gets wax out of the pores fairly well and leaves behind a protective film that is fairly long lived. It's also good to use on the paint film.
Some folks feel that the marks on the film are so much harder to remove than any on the paint due to porosity or heat/friction factors. You can painter-tape problem areas and that saves clean up time later on but can look ugly. Some folks suggest adding lots of wax that is not polished off to lubricate the areas.