To clean bObi's front wheel, you will first need to remove it from her underside. Turn bObi's front wheel towards her bumper and, using a screwdriver for leverage, grip the wheel firmly and pull it up.
You may remove and clean the smaller wheel on bObi's wheel piece. To detach it, grip firmly and pull.
Remove the 2 screws holding the wheel piece together with a Phillips head screwdriver, then pop the piece open.
After cleaning the inside of the wheel piece, replace its outer casing and align its edges.
Reinstall the 2 screws on the wheel.
Lastly, place the front wheel back in its space on bObi's underside. Turn the wheel to face the bumper, then push it down to lock it onto bObi.