In the washer and with an iron? ;) Sorry...couldn't resist....it was just there!! :lol:
I used to just wrestle with them until I learned about safety pinning selvages...with the wide backings I now pin them with the same folds they come to me with...for the length of the fabric. Wash and damp dry...and then I wrestle with them to iron! :lol: (I still only have a small, regular ironing board)