Elderly cat urinated in the middle of the bedroom carpet. It was dry when found. It's a wool mix carpet. Dh did the initial clean with water and white vinegar. We've now got a 1m square patch of dirty tide as well as a still visible middle stain and potentially damaged carpet fibres. I've since tried an ancient bissel carpet cleaner machine twice with carpet shampoo and then with 101 stain remover. The carpet is fucked, isn't it? Anyone have any miracle suggestions?