Pretty much I am a washer. I mainly want to take care of bleeding and shrinkage (if any), then secondly the 'dirt'.
BUT, I do a BOM at my LQS and receive enough fabric to do the one block, so washing is not in the cards. Yes, with the sizing still in, it is 'easier' to handle.
Another BUT, sizing/starch to the rescue. I now invest in Best Press.
