Your's may well be fox wee. Female dogs tend to pee in the same spots, exacerbating the problem. Foxes may be less discriminating, using various points to leave their scent.
You can buy amino acid food supplements for dogs to change the ph of their pee but you don't have a dog. You could leave some of the "special biscuits out for the fox but if you leave too many it will harm it.
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