I just hop in my car and go. It's not bad in the winter because I cool off very quickly from the walk from the gym to my car, but in the summer it is pretty gross to sit and marinate in my own sweat until I get home...but, I'd rather have the comfort of my own shower where all my stuff already is instead of having to pack everything up to take to the gym.
Here's my story: In March 2008, I bought a 2008 Subaru Forester. I insisted on the dark gray metallic color with the premium package. (ie. panoramic moonroof, heated seats, etc.) So when I would go to Zumba or workout and then not shower after, I would carefully place a towel on my seat. If my sister was riding with me, I would have her place a towel on her seat.
This past November, I was rear ended - my car spun into a tractor trailor truck and was totaled. (I was totally fine) So heartbroken...
Now, I say F-it! I just get in my car and go.
THOUGH - I do also work out on my lunch break (gym at work) and I DO rinse off after. I get very sweaty and I can't be getting back in to my work clothes and going back to work with my pits and crotch all swampy with sweat. (I paint a lovely picture - don't I??)