Robot vacuum leaves visible dust lines or misses areas during cleaning, especially along walls or in corners.

Safety first: Turn off the robot before handling brushes.

Step-by-step:

• Inspect side brush: Check if the side brush is intact and not excessively bent. Replace if bristles are frayed or shortened.
• Check main brush: Remove and inspect the main brush. If the rubber fins or bristles are worn flat, install a new Roborock main brush.
• Increase suction mode: In the app, set cleaning mode to Balanced, Turbo, or Max for better pickup.
• Empty dustbin and clean filter: Ensure the dustbin is emptied and the filter is clean to maintain strong suction.

If coverage is still poor, consider remapping the home and adjusting room cleaning settings.