Go back to your college chemistry text books.

Long chain hydrocarbons are long chain polymers. Take, for instance, polyethylene:



A long chain polymer / hydrocarbon. Which, coincidentally is what your Waves are made of.

What is coming out of the tailpipe of the motorhome is neither. It's soot. Mostly carbon. Which happens to stick very well to the waxy polyethelyne hull surface of the Wave.

Polyvinyl alcohol (mentioned earlier) is another long-chain hydrocarbon that when cross-linked with borate ions, forms something familiar to most kids - Slime.

{whoa - somebody didn't like me stealing their bandwidth}