Originally Posted by cldpsu
It's one thing for a article of clothing to appear dirty, and yet another for it to actually be dirty, at a microscopic level. If you never wet the bed, do you go a couple of years without washing the sheets? All the nasty bacteria you put on it is there, whether we see it or not. I guess its just one's tolerance of dealing with that. fumes from whatever don't really appear as a stain on clothing so you can't possibly consider saying its perfectly fine. Take Chile and the smog issue. If you are out long enough in a white tshirt in Santiago, the capital, you will notice a hint of black to your shirt, from the polluted air. a lesser degree to where the black isn't noticeable doesn't mean it isnt there. I will wait the proper amount of time but i definitely know its dirty, regardless the stain.
I'll try to put this as simply as possible. If you get DIRT on your jeans, or live in a polluted area, then washing them may potentially be necessary. However, for people that don't wear jeans in a way that they get dirty, or clothing in general, they don't need to be washed because the oxygen from the air will oxidize much of the detrius that collects on the jeans. Bacteria or fungus don't grow on your jeans unless they've gotten wet or have some sort of media to grow on because they have no nutrients. Bacteria can't digest cloth (well at least most bacteria) and in any case they gain no nutritional value from it. This is completely ignoring the fact that bacteria and other microorganisms are on everything we touch anyways. If you are really worried about jeans being dirty, airing them out outside on a sunny day will remove most scents and the combined effects of light and wind will clean them quite a bit.