The Hoover® Clean Complements™ Scent Booster in Spring Surge gives you the option to customize your clean. Simply add to the clean water tank of your carpet cleaner along with your favorite Hoover® carpet cleaning formula. You can add a little, or a lot, depending on your desired level of scent– it's up to you! Now, you can keep your carpets first-day fresh for up to 7 days.