Ohh. This is a sore spot for sure.
It takes tact.
I shower after every visit. I had an abusive ex in the past who just because I was an SP for 6 months when I was 18. I never hid it from my future partners, but some weaponized a short past to embody an entire personality. He would say if I wanted him to be intimate with me, I had to shower first because whores were dirty, and needed to be clean before being touched. (By this point I hadn't been a SP for 15 years.)
When returning to SW it is almost an insulting trigger depending on how I am asked about cleaning before.
I do have 2 regular sweeties I see who have braught it up nicely by mentioning they like DATY/DATO and just feel more ready for it when a shower is just had. Now it is just part of the encounters I have with them. And they know I won't wet my hair in their shower. I don't bring my post shower hair products around with me. And even after I take the shower starting those appointments, I take a shower after too.
I don't want to Drive home feeling ick from lube, and smelling of someone else's body sweat, I want to feel clean myself after having fun before leaving to either go home, or if I'm lucky see someone else to keep my fun going. I wouldn't want to see someone smelling like the last guy. It just isn't sexy to me.
On hot days it has also happened, I would ask if they mind i freshen up in a quick shower before starting, if I'm feeling ick from my own sweat.