Wow, so the ancient bottle of malt vinegar in the cupboard might do the trick! It's worth a try. The smell of vinegar would be preferable to the aforementioned.
Clean with washing powder...
Then lemon juice...
Neat stuff ... soak the area with it... leave it a couple of hours.. then just wipe... I have an Abyssinian stud boy who spays... and the only way to neutralise's his pen is this... I also add some to his bedding...
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