Narwal Robot Vacuum and Mop Narwal is an relative newcomer to the robot vacuum market. It's a sweeping/mopping hybrid that is pretty impressive. It's costly and is hindered by a cumbersome, slow learning curve application. To mop, you place a sheet of detergent into the base station's clean water tank. https://vacuum-mop-cleaner-robot21744.blog2news.com/28243460/why-is-eufy-robot-vacuum-so-effective-for-covid-19