I dont think anyone is bothered by precum. When precum becomes a problem for me is when people wipe it off with their fingers and then try to finger me or they start touching stuff with precum on their hands.
Someone did that last week. They wiped a big gob of it off their dick, wiped it on their bare ass and then started touching all my oils and lubes

I sanitize everything afterwards anyway but during a session I like to keep everything clean. I like to know that when I touch a bottle of lube its sanitized and doesnt have anyone's jizz on it.
There are people who are nowhere near as respectful as you so as long as you're clean and showered I think it's just a natural part of the proces I've come to expect.
I do a lot of massage so by the time ive flipped someone over sometimes there is a lot of precum. Thats normal.
Some people do naturally have an odor though so if you have a strong odor, you should probably just wash up when you get there.
I know what you mean, though sometimes i'm freshly showered and I have to drive an hour and a half and I dont feel as fresh when I get there. My old ho trick is to put an unscented baby wipe between my lips and pull it out of my underwear right before a session.
I dont like showering in a strangers house. Its a very vulnerable position to be in.