I simply find a laundromat. Grab a book/tablet and sit and observe the locals. Get a big-assed washer, do the entire load. Transfer to the biggest dryer, do the same. 2 hours max I find for wash and dry. I have my regular places in LAX, BOS and the burbs of London I get my laundry done at. Know the best coffee places around to kill some time whilst I wait too.
Other options i've found (which I use in LAX) are the bag wash-n-fold services that charge by the pound. Drop off a big bag of washing, pick up the next day all laundered and folded neatly in a fresh bag. A little more expensive than laundry, but around 20-25% or what the hotels charge (downtown LA is a wasteland). The place I use will even deliver to nearby hotels free of charge and offer a same day express for a small surcharge.
Where there's a will...