I hate to say it - but I do not like the JoAnn batik fat quarters - I think they are of a coarser fabric. I do not know about their batik fabric on the bolts though - have not bought any of it. Yes, I always prewash (handwash) all of my batiks -including fat quarters. I use my pure white dish pan - put in a little warm water with a drop or two or liquid dish soap (Dawn) or Tide - swish the still folded fat quarter in the water and see if it bleeds. If not, then I rinse in cool water and wring dry gently - then roll in thick towels - then hang them up on an inside clothesline. Very little wrinkling. I do iron when I use the fabric later.