I tend to wash my batiks, just to make sure they don't run...but then I have to pre-wash any other fabric that I put with them so the quilt will shrink uniformly...then I end up with some pre-washed and some not...
I take a paper punch, (the thing that punches a hole) and put holes up and down the selvage of what I wash..that way I can keep it all straight...otherwise I'd be washing some 3 times and other not all!