ok this is going to sound bad but...... peel an onion and pop it in a bag with the fabric. Works a treat and doesnt make the fabric smell of onion if you dont cut it. This is an old cat owners trick. Thats an old trick and a trick for owners of old cats lol. If you cat has an 'accident ' on the carpet, cut an onion in half and place it directly on the spot. It will leech out the smell and discourage the cat from returning. You have to leave the onion there for a couple of days. Based on this trick i tried it as discribed in a bag of niffy fabric and it was brilliant.