Wipe off dust and grease at the mounting location, and crimp the suction cups so that the air inside them is pushed out. / It can only apply for flat surface. / Put the suction into hot water for a while and dry well before apply to surface when the suvker become deformed.Keep away from fire and other sources of heat.Do not use a scrub brush or polishing powder with this product.Do not use this product for purposes other than its intended purposes.Do not use or store in a place subject to direct sunlight.