I have always just handwashed my undies/bras in the sink and then just hung them on the clothes line in the bathroom (over the tub) at WDW resorts. I always bring the nylon type on the trip, they dry quicker, if you do it right before you leave in the am, by evening time, they will be dry and the maids do not bother them. Rinse them well, and like a previous poster said, wring them out in a towel.