Hi and Welcome from southern Indiana!!
No, I wouldn't wash and I wouldn't throw them away either!! If your blocks aren't the same size, you might want to recheck your 1/4" seam allowance. I have a 1/4" foot for my machine and I move the needle over 1 spot closer to the edge. This helps me with my problem of being "off" on sizes....If you don't have a 1/4" foot, put some brightly colored tape on your machine at the 1/4" mark and see if this helps!
But most of all, have fun!!!!