What was an obsessive-compulsive disorder patient most afraid of? Of course, it wasn't something that could be seen. Whatever could be seen could be removed. For a patient with a serious obsession with hygiene, as long as something could be removed, it wasn't a problem. They could spend a lot of time getting rid of it.
What they really couldn't tolerate was the psychological hint.
Just like a clean freak who washed his hands after peeing. Turning on the faucet with his hand, he would feel that it was stained with bacteria from the balls. After washing his hands, his hands would be clean, but if he switched it off, he would be touching the balls' bacteria on the faucet. Such repeated actions made it impossible to feel completely clean.
Unless it was a faucet that had automatic detection, a patient with a severe obsession with cleanliness could struggle in front of the sink for a long time.
