Fo not wash your strips! Many of us don't prewash anything.... Good fabric doesn't shrink all that much, and seldom bleeds.

I haven't ore washed anything, including flannel, in years... No problems... But, I way my quults in cold water only... And always use a couple of color catches the first time they are washed.

So... Order your besutiful strips snd make a gorgeous quilt.... Have fun!