I've had issues with sweating too but my commute is only 5 miles each way. With the heat already here (speaking from North Florida that is), the best things I've found is wearing cycling specific clothing, pack your change of clothes and supplies in a pannier as opposed to a backpack or messenger bag, and allow ample time to cool down. That last one is themost important for easy cleanup. I too shower before the ride in and if you give yourself 10 minutes to cool down, I'd bet a quick alcohol wipe would be sufficient before changing into your work attire or uniform. I share a small office with a guy who has a good sense of smell (unlike me) and he hasn't comlained about my scent yet.