Usage patterns
〈人〉は潔癖だsomeone is fastidious/obsessed with cleanliness
He's so fastidious that even a single piece of trash on his desk bothers him.
潔癖すぎるto be excessively fastidious about cleanliness
She's so overly fastidious that she can't eat anything at other people's houses.
潔癖なところがあるto have a fastidious streak
My father has a bit of a fastidious streak.