Use Steam Mode to deep clean, and Boost mode for stubborn spots and stains. The mop has two water tanks—one for dirty water, one for clean—and you can fill it up with water or Tineco's cleaning solution. This mode is loud and it takes a few minutes, but it washes and dries the brush roll and moves everything to the dirty water tank. Rinse out the dry filter, rinse out the dirty water tank, and your mop will be sparkling clean. If you're looking for a steam mop that will bust through even the grossest of messes, this is the one you want.