 Thing is, those pet stains can be a problem for you because, well, they smell. And they can be a problem for resale because they're ugly. So take care of them now. There are tons of pet stain removal products on the market. Many of them work well, but you have to use them right away. You can also try a more unconventional remedy like window cleaner or a 50-50 mix of vinegar and water. Whatever you do, don't let the stain just sit, or else you're in for a harder time later. I'm sorry. That pun really stinks.