When I was commuting I'd stop at a park about a mile from work and drink some water and take time to cool down. Then I'd slowly ride the last mile to work.
No shower so I'd clean up with cool water and a wash cloth at the bathroom sink.
When I had cooled down enough I'd apply deodorant. A little baby powder between the legs helps too.
I had a small fan on my desk and I'd turn it on as soon as I sat down.