NaturVet Yard Odor Eliminator, Stool and Urine Deodorizer, 32 oz.

I made a 5'x4' potty pen for my dogs on the roof-top terrace out of 2x4s, lined it with landscape fabric, and filled it with pea gravel. Odor eliminator has kept it absolutely odor-free for a year now. I can walk on the pea gravel in my socks and there is no smell. I planted flowers along the back of the pen to camouflage that it is for pottying, and odor eliminator didn't harm them a bit. I hose the pen weekly (unless it is freezing) and spot spray it as needed. My judgmental geriatric dog and my hospice dog appreciate NaturVet Odor Eliminator's subtle, nice fragrance, too.