I sweat therefore I am.
I gave up years ago. I don't think I sweat excessively. But in the winters, mild here, I've been cold and still sweating where my backpack lays on my back. I don't see that as a problem. It's just sweat. Wipe down with a damp wash rag, towel off and put on my work clothes.
Trying to ride slower doesn't work here in Phx in the summer. Not for me anyway.