The subject is covered a lot, and will be for as long as new riders start commuting.
The basics are:
- Shower just before leaving.
- Wear clean kit.
- Cool down on arrival.
- Take a birdbath in the sink.
- Change into work clothes.
I find that no matter the weather, I need 15 minutes to cool down and stop sweating. Even in January. It seems to take no longer in July either. There's no point in starting to wash up until after that's done.
Then I can take my birdbath. Lots of people use wet wipes, but their single-use disposable nature bothers my inner green. I use the sink and the provided anti-bacterial foam soap. Rinse, dry with the towel I keep at work, slap on a coat of deodorant and get changed.
I work the Circ desk at the library and have yet to hear a complaint about BO from either staff or patrons. And lemme tell ya, we have some patrons who will complain about anything.
Edit: I shoot for arriving 30-35 minutes before work. That gives me an extra ten minutes or so in case I have a flat.
I have a 12 mile commute in Tucson, Az and this works well for me.
I would add that cold water from the sink over my hands and head do seem to help the cool down period. Also I leave my shoes at work in a drawer and hang my cycle kit on a hanger. I hang that on a wall in my cube. No complaints so far.