I've done that, it works great and cleans the hats good without destroying them.my dad has a great way of washing hats, in the dishwasher, works good, no tumbling and its just water because you dont add detergent to it
Hmm.....I'd like to know some good ways to break in a hat too....without getting it wet or dirty. I have a few hats that I still don't have broken in.