Keeping the dock clean

We have had more geese come to visit. Up to 50 at one time. The geese tend to make a mess out of the dock. I don't mind them fertilizing the lawn, but I want to use the dock. I got a motion controlled sprinkler and aimed it at the dock. When the geese come up on the dock, they should get sprayed with water. Lets hope it works.


Here is a closeup of the sprinkler.