When installed・ then wipe the surface of the first adsorbed on the surface of the suction cup can be pressed and asked adsorbed on a smooth・ flat surface. 

2: If you find it easy to slip sucker・ can be coated with a small amount of water on the inside of the suction cup. 

3: If the suction cup with a long off or become difficult to adsorption・ please foam after drying at about 10 minutes in hot water of 60 degrees・ can be reused.