Hi, our cat, Scraps, is about 15 years old now, and for the last few years has been using a litter tray in the back porch, and that was fine. About 2 weeks ago we had all our windows and front and back doors replaced, and as a result of this there is a slight chemical smell from the sealant. Then last week we went on holiday leaving Scraps at the cattery with our other much younger cat, Chloe. We've been back about 5 days now, and she still hasn't used her litter tray at all. I know she sometimes goes outside, but in the last 5 days she's weed in my sisters room and near my bedroom door. I've just spent all morning cleaning the damn carpet, and I was just wondering if anyone has any advice? For now I've put her litter tray in the kitchen, because it seems like the only way to get her to use it again, but obviously this isn't a long term solution, due to hygeine! Any suggestions will be much appreciated. Thanks.