I would wash it by hand. Not so much for the shrinkage - but for the bleeding. I just got done gently hand washing all of my batiks - over 200 pieces - from fat quarters to yardage - and at least half of it bled. I did all of them in a pure white dish pan in my kitchen sink and most of the darker, brighter colors turned the water into colored water. I gently rung the water out of them and then rolled up in big thirsty towels and let them sit for awhile. Then I hung them over a clothesline in my living room that my DH put up for me - I did not want them outside in the sun. Most did not wrinkly too much this way.