The Roborock S7 features a sonic mopping system that can vary from 1,650 times per minute up to 3,000 times per minute to disintegrate surface dirt andd dried-on spills.

But the Roborock S7 Plus ($950 with the auto empty dock or $650 for just the bot) has convinced me these multi-tasking robots have some value, after all. This hybrid vacuum / mop does do both jobs ...