By Sarah Begley
March 6, 2015

Public urinators in the St. Pauli neighborhood of Hamburg are in for a rude awakening: a community group has applied a special water-repellant paint to the walls of certain buildings that sprays liquid back in the direction it came from.

The nightclub/red-light district has been plagued by night time revelers relieving themselves on walls, and residents decided that this solution would not only protect their buildings but also send the message loud and clear that this behavior was unacceptable. To give potential offenders a fair warning, Reuters reports the group has put up signs that read “Do not pee here! We pee back!”

The paint, which has previously been used on ships, is expensive — a 6 square meter area costs 500 euros to paint — but the organizer of the group behind the initiative says the community is saving money on cleaning.

[Reuters]

Read next: There Is Now an App for Prostitution

Listen to the most important stories of the day.

Contact us at editors@time.com.

SPONSORED FINANCIAL CONTENT

Read More From TIME

EDIT POST