Showers

There is another answer to this conundrum of course - get fitter. The fitter you are, the less you sweat for a given output. I go pretty fast on my commute but I don't break into a sweat because I'm not really pushing it that hard.

Excessive Sweating While Exercising Means You’re Not Fit
In fact, it's just the opposite. Sweating during exercise is a sign of an efficient cooler. An athlete who has adapted to keep the body core cool during exercise will shunt blood to the skin’s surface more quickly and release heat from the body. At the same time, the sweat glands increase their output and thus cool the body during sweat evaporation. While fit people produce more sweat than sedentary folks, they lose less sodium, because more of it is reabsorbed by the body. The result is a more efficient cooler.
http://sportsmedicine.about.com/cs/conditioning/a/aa052001a.htm