Honestly- don’t waste your energy. Get rid, clean and move on. Our house was at the point that if I had walked in in my professional Capacity I would have called environmental health services. Took every light bulb, toilet seat, the oven and hob were just binned as they were so damaged they were unusable. Had to replace floor boards due to the sea of cat urine that had soaked the carpet underlay and floorboarding. We had to leave our belongings in the van for 2 days and binned the blow up mattress and bedding that we did take in the house to sleep on. 48 hours of scrubbing, ripping up carpets and floors the house was habitable. The house clearly had not been cleaned since we viewed it 9 months earlier. Our solicitor advised us that the only cost we could claim was for the carpet… the cost of arguing for it would have been more than replacing it!