We only moved here 9 weeks ago and since day one i have been finding pee and poo behind the sofa and occasionally at the back door (sofa and back door both in kitchen). There are 3 litter trays in the house and the cat has access to the entire house so no issue in getting to the trays. Should i just give in and put a tray behind the sofa? Was hoping to avoid it but the smell is there anyway when he pees on the floor!