i haven't bought any at Joannes, and have not seen a dry clean only on the fabrics but i bought bamboo/cotton blend fabrics a year ago and used them in a quilt and in a couple table runners...washed up just fine and is beautiful...holding it's color, and soft hand beautifully!
i have a cotton sweater that says dry clean only too...but i wash it all the time...
i would cut off about a yard, wash it, dry it and see how it does. i did notice when i washed mine there was NO SHRINKAGE...like you get with 100% cottons.
my wools all say dry clean only but they wash up so beautifully!