oh yeah - been there. I honestly thought REDS were the only problem. Oh no, not the case. Bought some beautiful blue batiks - not at a cheap price either. Overdyed....and didn't prewash. Thank goodness when quilt was washed, it didn't bleed overly badly over the entire quilt....used something someone recommended for the 2nd wash and came out clean as could be. That was years ago - so darn if I remember what in the heck that stuff was.
Now everything gets prewashed...even if it means soaking as a means of washing in lieu of the washer!