SIMPLE GREEN Outdoor Odor Eliminator gallon $6.15 at Amazon
I have turf in my backyard. It tends to retain the dog pee smell. This stuff works well to reduce the smell. I use it once every week or two. You'll need the sprayer to attach to your hose. Typical price during the summer is about $15. Save a little more with subscribe and save ($5.84)! Hope this helps someone.