I want to attach some suction cups to a surface, such as a ceramic tile.
The suction cups tend to stick for a little while, but inevitably fall off sooner or later, possibly due to microscopic pores or uneven spots in the surface, or simply because those are bad suction cups.
How can I increase the adhesion, while still being able to easily remove them later on?
I have had this problem when attaching suction cups to various surfaces, such as ceramic tiles, plastic, even glass
What did not work:
Wetting the surfaces; even generous amounts of water, soap, or spit did not help.
washing both surfaces vigorously
strong pressure when applying the suction cup, removing all bubbles
Common workarounds such as gluing or nailing leave permanent marks. Double-sided sticky tape tends to fail quickly in the presence of water.
Ideal would be some sort of non-permanent glue
I am looking for a way to make suction cups suck just a little more.