Line drying in the sun is a time honored means of brightening whites. But I had never guessed how effective it can be.

I have a pair of white bath towels which developed mysterious, spreading yellow stains all over them, stains which I could not remove no matter what I tried (Borax, oxygen bleaches, stain removers), and which I may have actually worsened by a final, desperate flirtation with chlorine bleach a few years ago.

The towels were in good condition otherwise, but I wouldn’t hang them in the bathroom because– seriously–they made us look incontinent. I downgraded them to “slop towel” status, and didn’t think about them much again, until lately, when I was considering getting rid of them, to save room. But how to do that? I have too many rags, Goodwill wouldn’t want them, and throwing them in a landfill would be beyond the pale. I pondered composting them as an experiment, but figured they’d need to be shredded.

Finally, I decided to hang them off the side of our porch for a couple weeks (in good weather, of course!), just to see what happened. Day and night, I just left them there. Turned them whenever I thought about it, then forgot about them entirely.

Today I pulled them off the porch, and they look a whole lot better. I’m shocked they’re not counter-stained by diesel particulate. There are a few intractable stains from their days as slop towels, but 95% of that nasty yellow splotching is gone. They will be rotated back into bathroom use.

Mr. Sun, I’m impressed.

Max Liebermann, The Bleaching Ground, 1882, Wallraff-Richartz Museum

Sun was once the primary way women used to keep their whites white–urine and lye were other less pleasant alternatives, as well applying bluing to counteract yellow. All of these may have been combined with sun exposure. Villages had designated, communal areas for spreading out laundry. Do an image search for “bleaching ground” and you’ll find lots of old paintings on the subject. Linen manufacturers also used to bleach linen in the sun, so you might find pics of huge operations as well as ordinary laundresses.

• Some nice factoids on old fashioned laundry techniques can be found here, at Old and Interesting.

• I’ve read that to rid yourself of perspiration stains on white shirts you can mix lemon juice and water–maybe at a 50/50 ratio? Soak perspiration stains in that and then lay shirts out in the sun to bleach. I’ve not tried that myself, since Erik and I have totally given up on wearing white.