If you had a genuinely bad experience I'm sure you can find a way to express it without being insulting. Having said that, it does seem like a common response from ladies is "hey you were a stinky nasty little thing, of course I didn't give you what you want".
So maybe don't use the excuse that you already showered this week?
I dunno I mean 100% of our one experiences were super awesome haha, so I suppose we don't have that much room to talk. But I get the impression that if you A. find an escort with verified photos and positive reviews, 2. Shower right before you leave and when you arrive if she offers (in my experience in general if a lady asks you if you want to do anything hygiene-related, you need to), and D. Don't be a dick, you're probably gonna have a good time.
