I’m about to skin both my cats alive! Ever since my older cat’s littermate sister passed, she pees only on the plastic mat I keep under the litter box. An acquaintance surrendered her male cat to me. At the time he was just over a year old. I immediately took him to be neutered. He pees on the laundry! Clean laundry. Dirty laundry. Doesn’t matter! I have two litter boxes in the house. I clean the pee up with vinegar or wash my clothes with vinegar to cut the smell. I love my babies to death, but something has gotta give.