In order to combat the smell that will inevitably follow, you can use apples. My wife leaves the windows down all the time, and even though you vacuum the out of it, it still ends up smelling a little rank after a short time. If you cut up a few apples and leave them in the car, they will suck up most of the stink.

We got this tip from a neighbor after our cat peed all over the back seats.

spiffy