NL HOME Powerful Utility Hooks or Hangers Set with Vacuum Cup for Door or Window, Set of 4
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SUCTION CUP HOOKS ONLY Stick On Smooth, Clean & Flat Surfaces (glass, mirrors, and tiles). Clean the area you plan on sticking them to with alcohol first
Wipe Clean (Would suggest you cleaning the area you plan on sticking them to with alcohol first) and Wipe Dry the Surface Before Use Scrub the surface with a household cleaner, rinse and dry thoroughly. Clean the surface with rubbing alcohol and dry thoroughly. A suction cup will not adhere well to a dirty surface.
Place where you want it and press the suction cup firmly in place, making sure there are no air bubbles between the cup and the mounting surface
Pull down the hook & lock it in place