what is the best carpet cleaner machine for pet stains?
['Best Overall: BISSELL Big Green Deep Cleaning Machine.', 'Runner Up, Best Overall: BISSELL ProHeat 2X Revolution.', 'Best Budget Pet Carpet Cleaner: Hoover PowerDash Pet.', 'Easiest Carpet Shampooer for Pets: Hoover Smartwash Automatic Carpet Cleaner.']