My work envoroment is dirty and since I have to interact out in the shop, I usually can get away with having to do any major clean up. There are days where I have office details and I do like to be a little bit cleaner on those days. A wipe down with baby wipes is refreshing. A regular wet towels is cheaper. Use deodorant before the ride and after the cleaning.

Avoiding sweat if at all possible is the best route. If you can leave before sunrise, you will be cooler and sometimes too cold especially here in the bay area even during a heat wave. Unless you are wearing bike specific clothing, then wearing loose clothing to get some venting helps. Same with pants. Avoid heavy lotion on the skin as that tends to hold heat (for me it does). If you have long hair, then tied it away so that you can have less restriction of air flow to your face.

Last but not lease, there are certain route that are much cooler, and I'm not talking about hills either. Rather those with congested traffic will have more cars, trucks and buses that are emitting hot fume out the exhaust which I can feel the difference in air temperature on a hot day.