I carry my change of clothes in a packback - rolled so they don't wrinkle. I keep wipes, deodorant, a brush and a towel at work.
On the hot days I'll actually use a damp paper towel to wipe my face/arms/legs down, comb out my hair and use the towel to dry everything off.
I also drink really cold water when I get in from a hot ride so I can get my core cooled down quicker.
Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, champagne in one hand, strawberries in the other, body thoroughly used up, totally worn out and screaming: "Yeah Baby! What a Ride!"