I have been using (and loving) Bumgenius on DS (3 mo, exclusively BF) and they are great, no leaks, outers wash beautifully etc.
The microfibre inners have all stained yellow though and I can't work out why. I wash at 40 or 60 depending on amount of poo. I try to line dry, but if the weather is lousy they sometimes go on an airer/radiator or if I have a lot of washing to get done in the drier.
So, why did this happen and how do I get them back to how they were?