Wow, so I had one prefold that was pretty badly stained. I hadn't noticed it somehow until I went to put it on Z today. He's still rocking the EBM poo, so, his prefolds sometimes stain yellow. But he also has green poops now and then. So this prefold was stained yellow, orange and then some quite dark green spots as well. It almost looked like it actually hadn't washed well, and maybe was still dirty. I don't know. It was bad.
So I did a quick hand wash this morning giving those spots a little extra love, and then I laid it out on my front porch, which gets very direct sun most of the morning.
Then I forgot about it. So I went out and got it around 1 or something, and the thing is literally spot-less, in the most literal sense of the word. There is not a spot of stain on it!
I've tried sunning before, and I have never really had what I would call even noticeable results, so I was blown away by this! Guess you have to have strong enough sun? Anyway... now I know where to stick my dipes if I was to get the stains out!