Tire rubbers and removing spots
An update for you guys removing tire rubber:
I get two kinds of rubber on my finish - one, race compound (race tires), and two, street compounds. I found there are two approaches best to use for removal.
If you get tire rubber buildup from the street, it tends to go on thicker. I had over 1/32" of buildup on the rear quarter panels by the rear tire edge. This rubber tends to melt at higher temperatures and buildups need to be dissolved, so the kerosene works best. For thicker areas I used a fingernail and helped scrape it off.
Race rubber is a different compound and can be treated differently. I've never gotten huge thick buildups but very thin streaks of rubber on the finish. After a track day, a liberal amount of soapy water and fine (blue) clay removes the streaks and spots fine without needing to resort to the kerosene.