I sweat even if I ride slow - I tend to run hot.

I sit for 15 minutes or so when I come in to cool down, then I use a Fresh Bath Body Wipe (I know not very green) which looks like a large wipe, but with more moisture. I keep deodorant and a small towel at work to help freshen up. Since I have a buzz cut, helmet hair isn't an issue although helmet lines on the balding head is kinda funny for a couple of hours.

I have 2 hangers at work that I hang my cycling clothes on to dry.