This mode uses UV light with the Shark's built-in camera to spot stains that it needs to come back to and scrub. The UV Reveal uses a back-and-forth mopping style that Shark calls HyperSonic Mopping to truly scrub at a stain, rather than just passing its mop pad over it. There are LED lights on the side of the vacuum that flash a deeper blue to show it's searching with the UV light for stains, and the vacuum's light also flares blue while it scrubs stains away. Shark says it did this intentionally so you can easily see your vacuum and understand what it's doing. My husband actually thinks the rug felt cleaner and fluffier than when I vacuum with a Dyson stick vacuum.