First remove coarse dirt with a vacuum cleaner or a brush. Recommended cleaning agent: Universal Cleaner (Part no.20396) in mixing ratio 1:10. Apply90-120 psiof compressed air and clean the area at a distance of 1-3cm, perpendicular to the surface, in even, meandering movements. Then wipe with a microfiber cloth to absorb loosened dirt. In order to dry the surface, close the ball valve to dry the surface only with air. Then wipe off the remaining moisture with a microfiber cloth. Observe: Clean surfaces to be treated in their entirety, not only partial surfaces. Do not add any other liquids than Universal Cleaner (Part no. 20396). Store completely empty.