Lots and Lots of Dust time!!! I would also groom the area once every week or so. This will get the dead, pee stained fur out..... You can do it more often, but remember to go easy as you can over groom. Also, baby wipes are generally used to help get some stains out. I've personally never used them. Another way that I know of, and have seen it work, is by rubbing corn starch on the effected area or putting it in the dust. I would only rub it in once, then just add some to the dust. You can use it up 3 days before the show, but I REALLY recommend that you discontinue use of it atleast a week before.