I have not washed my fabrics prior to using them. All have been wall quilts with the exception of a batik quilt I am now using on my bed, which has not been washed yet.
I have started to wash/dry my fabrics before putting them in 10 gallon ziplocs, and none of the batiks have bled.
Also, I have not had a problem with any of the batiks fraying. Due to the strip size, I do think I would hand wash if you are going that route.