How to Remove All Types of Stains From Concrete
Hose away any droppings on the concrete. Mix a solution of 1/8 of a cup liquid dishwashing detergent, ½ cup baking soda, and one gallon of water. Use a soft brush to scrub the mixture into the stain. Rinse, or use sawdust to absorb the soapy water. Sweep the sawdust away.