Shark CarpetXpert with Stainstriker, 2-in-1 deep carpet cleaner and handheld spot & stain eliminator, combines Shark's powerful suction & PowerSpray high pressure spray to deliver the best tough stain eliminationand the best deep carpet cleaning among full-sized deep carpet cleaners. Two unique chemicals mix and activate on contact in the built-in tool to deliver 20X more stain- striking power. Based on ASTM F2828 vs. full-sized carpet cleaners above 14 lbs. Based on TM110, vs. extractor market, using included stain cleaner and best-performing accessory. vs. Shark Deep Clean Pro Formula