Instead of a basic wipe-style mop, the S40 Pro uses two spinning mop pads that can crank at up to 180 rpm. One of those pads sits on a mechanical arm that extends to reach corners and wall edges ...

While robot mops get more expensive and more complicated, the two best robot vacuums we tested remain affordable, effective and convenient.

I tested six highly rated robot mops on the market. In the end, only two proved effective at mopping up messes.