If you have squeezed the nibs (Showerhead spray nozzles) and the water buildup is still not coming out, then we suggest using an interdental brush pick to gently clean the debris and reopen the shower head spray nozzles. 

Pic of spray nozzle:

Example of interdental brush pick:

Please ensure the surface is clean before attaching. Test on window or mirror to confirm it works.

For porous or painted tile we recommend using a clear silicone caulk and let it cure for 24 hours. Should you ever have to remove it from your tile, you can peel it right off without damaging your tile and grout.