Narwal Robot Vacuum and Mop Narwal is an relative newcomer to the robotic vacuum market. It's a sweeping/mopping hybrid that's quite impressive. It's also costly and is hampered by a clunky app with a steep curve. To mop, you place a detergent sheet into the base station's clean water tank. https://vacuummopcleanerrobot06009.bloguetechno.com/find-out-what-best-rated-robot-vacuum-tricks-the-celebs-are-using-63205674