Dog Pee

With the exception of when I was a young boy we have always had female dogs. Now I have two males and they follow each other around the yard and were one takes a leak the other one takes a leak right on top of it and then sometimes the other one will come back and pee there again. As you can imagine on a hot summer days the smell can become pretty bad. Currently I use this simple green spray that you hook up to the garden hose. Not sure if any of you have a similar problem or if you use a different odor eliminator? The simple green works OK but you don’t make it very far on one of them bottles. So I am looking for something that might be a bit more powerful and last longer. Any suggestions?