Wisconsin cops are on the hunt for a stinker costing the city of Sheboygan thousands of dollars in repair costs by repeatedly clogging the toilet inside a women’s public restroom.

The Sheboygan Police Department says that for the past year and a half, a person has clogged the women’s toilet in the Deland Community Center — by stuffing a 20-ounce soda bottle into the bowl each time.

“Why do this? I do not know, but if you help us find the person, I will tell you. This is very strange… and gross, but that is the reality of life,” the police department posted on its Facebook page Tuesday.

The septic stunt “has led to thousands of dollars in repair and labor costs and unavailability of the public restrooms,” the department said.