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Read my full review of the Narwal Flow 2.
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The Narwal Flow 2 is the robot vacuum to splurge on if you take the cleanliness of your hard floors seriously — it takes a certain confidence in cleanliness to walk around in bare feet at home. Between the sturdy XL roller and hot water mopping, the Flow 2 has the elbow grease to soak up large liquid spills and melt away sticky or greasy droplets without smearing.
If your household is prone to spills, perhaps from kids, pets, or frequent guests, the Flow 2’s accurate obstacle and mess detection technology will come to the rescue for those big in-the-moment messes.
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If you’ve sworn off mopping robot vacuums after a cheap one streaked your floor with dirty water, a roller mop robot vacuum should be your next move. The Narwal Flow 2 is my top recommendation halfway through 2026, mostly because it never really missed a spot in the several months that I was testing it.
Roller mop robot vacuums mitigate smearing in a few ways. The bath towel-like material is already thick and absorbent, and constantly rinses itself to keep the spill from being dragged across a clean floor. If the roller gets too soiled during a bigger cleanup, the Flow 2 automatically returns to the dock mid-cleaning to wash the mop with hot water. The Flow 2’s roller actually has flat sides like a conveyor belt, which Narwal says gets more direct surface coverage than the sliver of a cylindrical roller mop hitting the floor at any given point.
In my testing, the Flow 2 consistently mopped up spills of various consistencies, from true liquids like red wine and milk to sludgier splatters like pancake batter, chunky pasta sauce, and most impressively, globs of dried syrup. The Flow 2 is one of just a few robot vacuums that mop with hot water, making it able to dissolve the syrup without leaving the floor sticky. Hot water loosens the bonds that make grease slimy and hard to lift off hard surfaces with force alone, so the Flow 2 handles oily or greasy liquids better than robots mopping with room temperature water. During dry vacuuming, the Flow 2 did a commendable job with cat hair and small debris on rugs and kibble, cat litter, dirt, and crushed dried flowers on hard floors. I appreciate that the app allows up to three cleaning passes in the same session.
The Flow 2 is also such a thorough cleaner simply because it knows what kind of mess it’s dealing with — its AI spill detection is the most intuitive I’ve seen in 2026. The Flow 2 snaps a “before” photo when it approaches a mess that’s bigger than a few crumbs or a single droplet. After cleaning the rest of the area, the Flow 2 comes back to the dirty area for intensive zone cleaning. My Narwal app was also full of photos of extension cords, phone chargers, shoes, and random cat toys that the Flow 2 saw in my apartment while cleaning, even if the object wasn’t directly in the way. No one has time to tidy up before sending their robot vacuum out every single day, so it’s comforting to see such direct proof that the Flow 2 is, in fact, reacting to obstacles in real time.
