Suction cups only adhere to nonporous surfaces, please check that you are not attempting to place suction cups on textured, rough, or porous surfaces first. We recommend you clean the surface first with either soap and water or alcohol to ensure no debris on the surface before applying. Lightly damp the suction cup and apply pressure to stick.
If you are still having issues with your suction cups staying you can test the suction cups on a mirror to see if it is a problem with the actual cup – if they stick on a mirror, the cups are good to go.
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