How To Make Suction Cups Stick In Shower How Can I Get A Suction Cup To Stick To My Shower Wall?

How can I get a suction cup to stick to my shower wall? - how to make suction cups stick in shower

I bought a double-head shower today, and the tip of the handheld to a suction device for hanging on the shower wall. I have a (nylon? Vinyl shower I'm not sure that a very light texture ...),. The suction cup does not stick. What can I do to change the cup or the wall in order to stay here? Thank you!