Your Mogees sensor comes with re-washable sticky pads.
Just peel off the sticky pad from your Mogees sensor, wash it under some running water and wipe away the dirt.
Shake excess water from the sticky pad and wait for it to dry.
Re-attach the sticky pad to your Mogees sensor.
Objects that are covered in dust or loose material may not work with Mogees as it will just stick to the dust rather than the object.
Certain varnishes found on certain types of wood or furniture are sometimes quite hard to stick to!