Lori: I used the frosted Contact film on the window in my husband's shower. I put it up over a year ago and it still looks great, even with him steaming the room up every day.
Creede: Check out this link, it talks about the same thing. The best idea from that thread was using clear shelf liner. Super cheap, and looks good.
Severn: However, if you DID want to acid-etch, you can get etching paste in most art stores - hydroflouric acid? You brush it on and then wash it off.
Richard in LA: In May, I used an old film production trick and sprayed the outside of the windows with dulling spray. It still looks great 3 months later and took about 15 minutes to do.
Good Questions: How Do I Frost My Glass Without Etching It?