A beautiful magnolia in the state of Louisiana.

Window clings work on any nonporous surface using the power of STATIC!  Easy to remove, they don't use adhesive, so there's no residue if you want to remove or replace your static cling.  They can also be reused, so if you get tired of it on your window, you can put it on your fridge!  

For best adhesion:

Clean off area where you wish to apply your cling.  

Apply a little water to the surface.  

Carefully apply window cling.

You can use a credit card to smooth out bubbles, working carefully and patiently to move the bubbles to the edge.