John , I really wouldn't sweat it .When I was crewing on my brothers top doorslammer (cross between top sportsman and pro mod basically) , between rounds, you're lucky if we had time to clean dust, rubber etc off the body let alone all the different liquid residues ( methanol ,oil or anything else ) that some how seem to coat everything exposed or not. Quite a budget operation by the way (his wages basically) blown BBC, 65 impala ( never going to be superfast or competitive just fun).
Anyways keep up the fantastic work, thanks for sharing it, cheers Brett