I just take mine to the laundromat. Wash and dry, then my mom patches any tears they mangled into the blankets over winter. I store them in rubbermaid tubs in the tack room.
I've never had a problem taking them to the laundromat near me. The owner's wife is a barrel racer and we usually end up talking horses and watching our blankets go round and round together. =)
Spent a whole hour today laying in a pasture, waiting for a sparkling vampire to show up. Alas, I woke up and looked over, only to find a mound of horse crap. Sigh.