Yeah, whatever you do don't wear a shirt that you wore for even a short, mostly sweatless ride. Whatever sweat was in the shirt will grow a nice stinky bacteria that will go crazy as soon as you sweat in the shirt again, not good.

The last place I worked had showers, I've only been at this place durning cooler fall months. I'm not sure what I'm going to do when summertime rolls around, but for now the cooler temps along with a moisture wicking jersey have kept the sweating to a minimum. When I get to work I stay in my riding clothes for a few minutes (I don't wear spandex shorts and my jerseys are pretty low key) before I change. This seems to help a little. I try to get here before the masses so it's not as obvious.