Actually, I do. He has a medical condition that causes excessive sweating. I know exactly what their schedule was. He picked her up at the airport around 9:00AM. They drove about three hours, arriving around noon. Along the way, he's sweating like a steamfitter. They arrive, and both need to "clean up." Their event starts at 7:00 PM. That gives them lots of time to get dirty again...
How do you know all this?
If it's snooping, then you know it's only harmful to your mindset. If you need evidence for the affair, hire an investigator.