The neighbour across our back lane has slightly frosted glass in her bathroom window which is about 20 feet away from my office window, but it obscures NOTHING and she wears NOTHING and she spends a lot of time in there doing complicated ablutions - leg up on sink to clean or examine genitals is a favourite pose. Her other curtains are always closed so I think she may be a bit of a nudist at home as she's literally always nude in the bathroom, even if it's just to pop in for a pee. I'm pretty well acquainted with her daytime bathroom schedule - and before you say don't look, I can't help it, unless I work for 8 hours per day with my back to the window which I'm not prepared to do.
Anyway, I'm not disgusted or offended or anything, and if she doesn't care then I don't care - but what if she doesn't know? What if another neighbour does care more than I do and decides to be unpleasant about it, or what if someone decides to take photos? Should I pop by to tell her, or just drop an anonymous note so she has plausible deniability if she wants to continue her exhibitionist lifestyle? Or should I just ignore it?