A:Answer As Braava cleans, debris may accumulate around the wheel guards. Periodically check the wheels to see if debris has accumulated. Use the small notch next to the wheel, to access the debris with tweezers. Ensuring Braava is not plugged in, use a damp cloth to wipe off dust and dirt on tires. The mop pad or reservoir cleaning pad may need to be changed as well. Please ensure that you are only using iRobot Hard Floor Cleaner, Bona Floor Cleaner, or Clorox Ready Mop while cleaning.