I'm so sorry about your quilt. I hope you find a way to fix it. Cat urine is very strong and is corrosive. I have one inside cat and I can smell cat urine as soon as he does his business. I have two litter boxes. When he uses one, I take it out and bring in the clean one. I swap them out each time he goes. If I'm gone for the day, the cat stays in the utility room. It's big and and has a window he sits in. He's not being locked in a closet. LOL.