It was a very dirty trip

I last washed my car two years ago, give or take a month.

It struck me today that my car has Texas dirt on it.

And Oklahoma dirt.

Kansas dirt.

Colorado.

Wyoming. Utah. Idaho.

And Oregon dirt. Lots and lots of Oregon dirt.

I wonder, if I started an archeological dig on my car, would I find strata?

Artifacts?

And really, is there any reason I should put the effort into washing it?

That last one's not a rhetorical question. Can any of you think of a reason I should wash it? It's not as though I will, but if you've got one, at least I can feel properly guilty about not doing it.