i also have the same problem which has ruined loads of my clothes. i have a fairly new washing machine so i don't think it is that. today i removed the powder dispenser and found the bigest build up of black gunge. it was blocking the water dispersing holes which i presume means this has been running into my washing. i seem to have had this problem since moving to a different water 'type' area. could this be the cause? i too have tried everything to remove these stains but they seem to have completely stained the fibres both front and back of the fabric - not at all like a 'normal' stain which at least fades after time. am so fed up - have just ruined a pair of new white trousers. can anyone help with removal - surly there must be something to remove these stains.