Hi, I am a bit of a fan of the fox, I envy them, if I could be just
half as good a hunter I'd be as fat as lard !!

Having said that, I can see your problem, and if you are in a residential
area a shotgun will get you in deep doodoo.
Jeyes fluid might be effective, and will kill any germs.
I have been told that they hate the smell of human urine, but I
don't suppose your clients will like it much either.
I will watch with interest to see how you solve this one,
Good luck.