Our horse-product tester was so impressed with Clean Stall that she bought more. The all-natural stall treatment helps reduce ammonia odor, pathogens and fly larvae. Capable of absorbing 80 percent of its weight, according to the company, Clean Stall is formulated to improve stall sanitation and aid in fly control, without harming animals’ skin, hair or lungs. Sold in a convenient 15-lb. bag, it is applied directly to bedding at 1 lb. per 100 sq. ft. The product can also be used in cat litterboxes, dog kennels and bedding.