In the long run it would be cheaper to just bring an extra body or two. Paint them the same, drop on the clean shiney one before your main.
I just fill a small bucket with water and a little soap and wipe down my body, wheels, and wing with wet paper towels.
Then I wad the towel up and chuck it at the back of one of the truggy drivers like a giant spitwad and point to a 1/10th scale drivers.
Why put tear offs on your body, when your body itsself actually is a tear off.