You searched for: “rupophobia
rhypophobia, rupophobia, rypophobia (s) (noun) (no plural)
1. An extreme fear of filth, defecation, or of being soiled: Because of her dread of germs, Anita, having rhypophobia, had her used dishtowels put into the laundry every day, and had very clean and fresh ones to use in the kitchen every morning.
2. An abnormal aversion of dirt or filth: Mrs. Clean explained to her cleaning lady that she had rypophobia and put a lot of emphasis on having her home fresh, hygienic, and spotless!

This phobia may be related to fears of contamination and germs and therefore to fears of using public toilet facilities.