I would like to know what I can do to remove the smell of cat urine from our basement and hardwood floors. We are in the process of selling our house and have rented it to cat owners who let their cats pee wherever and now we need to clean it up. If there is something we can buy that is natural that would be a plus as my wife is pregnant and can't be around the chemicals. I also have asthma and am alergic to cats. Thanks