How Does a Roomba Clean Corners? (Explained)

Last updated on January 9th, 2024

Roombas have made cleaning so much easier. You don’t have to move around the house holding a vacuum for hours. They clean different types of floors easily and efficiently. But how does a Roomba clean corners? Let’s find that out in this article.

So, how does a Roomba clean corners?

A Roomba cleans the corners with the help of its side-sweeping brush. The s9+ has a D-shape, which can go in tight spaces easily. The vacuum’s navigation system and suction power play an important role in identifying edges and cleaning them. Based on these factors, different models give different performances.

Does a Roomba even get into corners?

A circular Roomba cleaning the edge
A circular Roomba cleaning the edge

Surprisingly, yes, a Roomba gets into corners. It avoids tight spaces because it tends to get stuck in them. But it goes into the edges with hesitation. One would question whether it is even possible for a round-shaped vacuum to clean edges. And again, surprise, surprise – it is possible.

But one can’t deny that covering the intersection of two walls is not physically possible for a circular robot. That’s where the edge-sweeping brush comes into the picture.

Role of the edge-sweeping brush

Every Roomba has a fan-shaped brush on the edge of the body. This is the edge sweeping brush. Its primary job is to push the debris towards the center of the vacuum, where it will get suctioned in.

This edge brush extends outwards from the vacuum’s body, which makes it possible for the robot to sweep into spaces its body won’t allow to reach. And that is how it cleans the corners.

The small gap that is left between the robot and the wall is covered by this edge-sweeping brush. It extracts dirt from the corners and pushes it towards the center of the vacuum so it can get sucked in.

All round-bodied iRobots are able to clean edges only because of this side brush. There’s also a specially designed model for cleaning edges and corners. Let’s take a look at it.

Roomba s9+ (Specially designed for edges)

How does a Roomba clean corners?: D shape of s9+ model
Roomba s9+ cleaning the corners

The s9+ has a completely different design than all the other iRobot models. It has a D-shaped body with a flat edge and a curve behind it.

This was designed as a part of iRobot’s PerfectEdge technology. Their aim was to create a vacuum that could easily navigate into corners and edges. And they were very much successful.

This robot even has a specially designed 5-pronged edge sweeping brush. Whereas all other models have a 3-pronged one. The flat edge combined with this advanced side brush makes the s9+ the best for corners.

But just the shape and the side brush are not enough for effectively cleaning corners. A strong navigation system is also required. Let’s take a look at the navigation system.

Read also: Does a Roomba scratch the floor?

Strong navigation system

Roombas have a tendency to get stuck in tight spaces. Older models didn’t have a robust navigation system. They would:

  • Bump into objects and walls
  • Randomly turn around

But now, they have come a long way. They use IR sensors in the front bumper for obstacle detection. They can:

  • Detect when they approach a wall
  • Slow down to avoid bumping

Thus, the robot can detect walls and corners, which enables it to effectively clean the corners. The edge sweeping brush, of course, does most of the job. But it is equally important for the vacuum to understand when it has reached a wall.

That’s why all iRobots give different performances at the intersection of two walls. Their suction power also plays an important role. All in all, these robots can tackle corners very effectively despite their round shape.

Final thoughts

A round-shaped Roomba gets as near to the corners as it can. The remaining gap is covered by its edge-sweeping brush. The D-shaped model is an exception to this as its flat edge smoothly fits completely into corners.

With the help of the edge brush and strong suction power, the vacuum can clean corners effectively. The navigation system of the vacuums also plays a role in detecting corners so the brush can clean there with ease.


Are Roombas good at cleaning corners?

Yes, Roombas are good at cleaning corners, especially the s9+.

Do Roombas get the edges?

Yes, Roombas can get the edges and clean the dirt that gets stuck on the edges.

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Siddhi Gurav

She is the editor and content writer at Smart Home Bulls. Siddhi merges her passion for language with SEO expertise. With 4 years of experience as a creative writer and a passion for smart home technology, she fits in perfectly at Smart Home Bulls. Her wide experience in content marketing has been an excellent addition to our team.

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