Your under clothes.

yes it doesnt seem much plesant with those stains

LOLOL..i put mine over the radiators!!..im not into hanging mine out either.....but maybe kids ones are ok ...as they dry quickly in the sun!

I have never personally hung any of our undergarments outside to dry. I prefer them to be dried in the dryer. Also don't think it's the neighbor's business what I wear under my normal every day clothes. That would make me feel a bit awkward if everyone knew the colors, the style, and IF they had stains. *LOL* I have seen many people hang their own out to line dry and honestly most of them have been stained. I would be too embarrassed for my neighbors and passerby's to see that sight.