If you’re trying to get suction cups to stick in the shower, try putting them on the glass door, a large tile, or on a smooth part of the acrylic wall. For suction-cup phone mounts, avoid putting them on textured dashboards. Try mounting it from your windshield or on your radio display. Suction cups do not work well on porous surfaces, like untreated tiles, fabric, or rough, soft plastics.
If there’s still residue stuck onto the surface, try using vinegar or rubbing alcohol instead since they’re harsher cleaners. [3] X Research source
For any stuck-on residue, try scrubbing the suction cup with vinegar.
Try to use the suction cups right after you dry so they’re still warm and flexible.
A good trick to keep suction cups on windows is waiting until warmer spring and summer months so outside temperatures don’t cause them to slip.
In a pinch, you can use any hand lotion instead. [9] X Research source Petroleum jelly works great to attach suction cups to glass.
You can buy silicone from your local hardware store.
Pushing against the edges could let air underneath the seal and weaken the suction cup’s hold. If you used silicone and any squeezed out around the edges, quickly wipe up the excess with a damp paper towel.
This is called “burping” your suction cups.
