Can anyone offer any advice, a friend of mine has just moved into a house and the smell in the back garden is horrible a strong smell of dog wee. The garden is slabbed/block paved (kinda) no grass. Apparently the previous tennants had four dogs. Who never stepped foot outside the gate or inside the house :(

so the council have cleared the garden of dog mess and cleaned it out with jet wahses but now they have properly moved in they have realised the smell of dog wee is still there.
So solutions please. They are loathe to dig up the whole garden and clear the soil from underneath but that was my solution., and seeing the size of it today I don't really blame them, although they do want to get rid of the smell before the warm weather really comes. Their baby daughter is only 7 months old but will soon be out and about, they will take up part of the garden this autumn and replace that with grass.
The neighbours are happy already and said the smell in the Summer was beyond belief and smelling it today 3 months after the people have left I can well believe it.