Is the retractable mop actually better than mop lifting?

For carpet protection, yes — it's the best solution available. The mop lifts completely off the floor and sits on top of the robot, so there's zero chance of carpet dampening. For mopping quality, no — the small pad with light pressure cleans worse than spinning mop robots.

Why doesn't it have a self-washing dock?

The retractable mop mechanism physically lifts the pad to the top of the robot, making dock-based washing mechanically complex. iRobot has reportedly been working on a washing solution, but at launch and through current models, manual pad washing is required.

Almost universally no, according to owner discussions. A Roborock Q Revo MaxV costs the same, includes self-washing, hot water, stronger suction, and better mopping. The only reason to pick the j9+ Combo is if you're deeply invested in the iRobot ecosystem or the retractable mop feature is a must-have.

How often do you wash the mop pad?

After every mopping session, which for most people means daily. Multiple owners describe this as the dealbreaker — buying a $1100 robot that requires daily manual mop pad washing defeats the purpose of automation.

Robot Vacuum & Mop

~$800

iRobot

iRobot Roomba Combo j9+

Name: iRobot Roomba Combo j9+
Brand: iRobot
Price: 800 USD
Availability: Discontinued

The Combo j9+ solves the carpet-mopping problem more elegantly than anyone: its mop pad retracts fully to the top of the robot over carpet, so even plush rugs never get damp. Underneath, you get the same excellent dual rubber extractors as iRobot's flagship vacuum — a proven pet-hair machine — plus reliable obstacle avoidance, smart room-aware mapping, and quieter-than-average 65dB operation. The hard truth from long-term reviews is the value math: at around $800 there's no self-washing dock, so you're hand-rinsing the mop pad after every run while cheaper competitors wash theirs automatically with hot water. The mopping itself is a light-pressure damp wipe, the small 210ml water tank can run dry in larger rooms, and the camera navigation is slower than LiDAR and needs ambient light. Owners recommend it mainly to iRobot loyalists who want the retractable mop and the ecosystem perks like the pet-waste guarantee; everyone else gets more automation per dollar elsewhere.

Approx. price

~$800

Runtime

120 min

Navigation

Camera

Best For

iRobot loyalists wanting vacuum + mop

Discontinued — no longer sold new

The manufacturer has retired this model; remaining listings are typically refurbished or leftover stock at odd prices. We keep the page for owners. Its current replacement is iRobot Roomba Max 775 Combo + AutoWash Dock.

Specifications

Camera

Not disclosed

120 min

Yes

Auto Mop Washing

Obstacle Avoidance

Yes

Carpet Detection

Yes

Auto Mop Lifting

Yes

Multi-Floor Mapping

Yes

Type

Robot Vacuum & Mop

Noise Level

65 dB

Dustbin Capacity

400 ml

Water Tank

210 ml

App Control

Yes

Dimensions

13.7 x 13.7 x 3.4 in

Weight

8.9 lbs

Warranty

1 year

Model

Roomba Combo j9+

Highlights

Retractable Mop PadP.O.O.P. GuaranteeSmart Mapping

Pros

✓Innovative retractable mop fully lifts to the top of the robot over carpet
✓Same excellent carpet cleaning as the j9+ with dual rubber extractors
✓Smart mapping learns room types and adjusts cleaning behavior automatically
✓P.O.O.P. guarantee covers pet waste incidents
✓Quieter than most competitors at 65dB

Cons

✗No self-wash dock — you must manually clean the mop pad
✗Mopping performance is mediocre compared to dedicated mop robots
✗Camera navigation is slower than LiDAR and needs ambient light
✗Expensive at around $800 without a self-washing station included

Owner Insights

The Combo j9+ is perhaps the most divisive robot vacuum in owner discussions. Its retractable mop mechanism — which lifts the entire mop pad to the top of the robot when it detects carpet — is genuinely praised as the most elegant solution to the carpet-mopping problem. No other robot achieves this level of carpet protection. Combined with iRobot's excellent rubber extractors, it's a capable vacuum.

However, the value proposition is savaged in nearly every thread. At $1100, it doesn't include a self-washing dock — you must manually wash the mop pad after every clean. Competing robots at this price (or even $400 less) include self-emptying, self-washing, hot water cleaning, and stronger suction. The mopping itself is described as basic — light pressure, no spinning or vibrating — more of a damp wipe than true mopping.

The Combo j9+ is recommended almost exclusively for iRobot loyalists who want the retractable mop feature and value the ecosystem (smart home, P.O.O.P. guarantee, US support). For everyone else, owners overwhelmingly direct them toward Roborock, Dreame, or Ecovacs for dramatically better features per dollar. The lack of a self-washing dock at this price is described as the single biggest product gap in the current robot vacuum market.

Pros

+Retractable mop pad lifts completely to the top of the robot — genuinely avoids wetting carpet
+Same excellent dual rubber extractors as the j9+ for pet hair
+Smart mapping automatically identifies room types and adjusts behavior
+P.O.O.P. guarantee covers pet waste incidents
+Quieter operation than most competitors at 65dB
+Strong obstacle avoidance prevents getting stuck on cables and shoes