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How does dirt detect work? • Robot Reviews
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iRobot Roomba MODEL - 531 - Robotic Cleaner Dirt Detect, As Is | eBay
Dirt Detection Demo | Roomba® | iRobot® - YouTube
What does it consider a Dirt event if this isn't it? : r/roomba
New iRobot Roomba 500/600/700 Series Brush Motor + Dirt Sensor Detector (#192948445897)