About the same commute here, ~16 miles, lots of hills, and 60-70 minutes ride time. In the winter, I need enough layers to stay warm on the downhills that I'm soaked in sweat by the time I arrive at work. It doesn't help that the last 2.5 miles on my ride are mostly uphill. In the summer, I'm drenched. To avoid being sweaty, I imagine it would take me over two hours to get to work and I don't have or desire to spend that much time commuting.

So, my answer is to get the ride over with as quickly as possible, cool down for 10-15 minutes in the air conditioned office (I've long gotten over people seeing me sitting in my lycra dripping in sweat), then washing up in the bathroom (no shower). Being a male who sweats like it's his mission in life and whose sweat tends to smell, the most important thing I do is to wash my armpits with soap. I just use the same soap I'm using on my face then apply deordorant. I definitely do notice an odor if I skip that step but washing them out does the trick.

I'm known as the nut who rides his bike in any weather, not as the smelly guy