Roomba vacuum and mop with an AutoWash dock that empties the bin, refills, and washes and dries the mop pad, with an auto-retracting pad.
Verdict: The Roomba to buy if you want iRobot with a full wash dock; the retracting pad avoids wet rugs.
The Roomba Combo 10 Max (x0850) comes with iRobot's multi-functional AutoWash dock: it self-empties, refills the robot's bin, washes and dries the mop pad, and the robot retracts the pad on carpet and avoids obstacles.
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Roborock
Self-emptying Roborock with sonic VibraRise 2.0 mopping, 10,000 Pa suction and 70 days of dock capacity.
The best mopping you'll get under $300, with self-emptying included. You still wash the mop pad yourself.
Dreame
Self-emptying vacuum-mop with 20,000 Pa suction and a dock bag that lasts up to 120 days.
Dreame
25,000 Pa vacuum-mop with a TriCut hair-cutting brush, extending mop pads and ultrasonic carpet detection.
Dreame
10,000 Pa robot vacuum and mop with MopExtend edge mopping and an all-in-one base with 75-day auto-empty and mop washing and drying.