I've been getting pretty sweaty on the way in lately, too. I've been bringing a complete change of clothes and a camping towel. Go in the bathroom stall, strip down, wipe the grossest bits down, dry off, and put my clean clothes on. Odor is not usually an issue for me, but others on the forum have recommended using hand sanitizer on stinky pits to kill the bacteria.
It would be better if we had a shower in my office, but this works well enough.
Also I take my helmet off for the last mile of the ride which is for me on a bike trail. Seems to help cool my head off.