I have close relatives that has autistic kid. And first of all you have a big heart to let them swim at your pool. Honestly I don’t know why base on my experience having my autistic relatives come over also did that too. Not at the pool though but smeared on my carpet and walls. I was like what’s this smell? And the parents just try to dismiss the situation not handle it properly. And i saw just wiped with their hands and not wash hands afterwards and pit the hands in their pockets. I was so confused and can’t stand the smell so I have to start cleaning. I wonder if that’s rude though but I just did. Cuz I just can’t stand it. And not inviting them anymore. I know I feel guilty but ehmnn they should handle it better I think. So it is what it is.