How to white spray paint bath window for privacy?
Have you thought of a bathroom window film? It's very easy to put there, and it works really nicely. I mean one of these:



They  come in a variety of patterns, from plain to very fancy. I think they are easier to apply than the sprays (I've put them on couple windows without any problems). They are made to be in the bathroom so they last long, and the surface is easy to clean from dust.