Hkoenig SWRC110 Manuel D'instructions page 17

3. Cleaning sensors and wheels
Slightly wipe all the sensors and wheels, as marked in figure below, with soft cleaning cloth or tool.
4. Cleaning charging poles
Clean the charging poles, as marked in figure below, with soft cleaning cloth or tool.
4. Cleaning suction passage and dust sensor
Clean the suction passage and dust sensor, as marked in figure below, with soft cleaning cloth or tool.
Note: Avoid allowing the sensors to get wet by water, thinner, etc.