The HoneyGear suction cup is made of a premium material which is designed with a special adhesive type surface which will not leave a sticky residue even in high temperatures of 120 degrees Fahrenheit, as may commonly be found inside a car during the summertime.
This specially designed suction cup material enables a solid grip even on slightly textured surfaces. However, the suction cup tends to pick up any dirt or dust that it comes into contact with and then the special adhesive properties lose effectiveness.
Not to worry! The simple solution is to occasionally wash your suction cup with water. Let it air dry before using. If the surface is really dirty then wash it with dishwashing soap in warm water.
For best long-term performance, plan to wash your suction cup with warm water once per week or else whenever it does not perform as well as it did when it was brand new.