Here's what I do - shower before leaving, wear a synthetic wicking/quick-dry jogger/cyclist shirt (mine is neon yellow for visibility) and pack my shirt or leave it at work. Arrive early so I can cool down. Then remove my shirt, wipe down with baby wipes, then air dry and put on the work shirt. I don't smell and actually feel fresh the rest of the day. I don't even change pants (I tend to sweat on the upper half)

If there's a critical meeting or something where I have to interact with people I take it slower and not try to kill it in the ride in.

I think if you change shirts and wipe down right when you get in there isn't enough time for the bacteria to grow and cause the smell. Of course, you've got a 9 mi commute and mine is shorter (a little under 7)

You'll also find that as you get more in shape from the regular commute (not saying you're not in shape now!) you'll sweat less and cool down faster.