I love ex officio underwear. It dries quickly. I use the towel to squeeze extra water out.

I have bought clothes lines and clothes pins. I never go to a laundromat. I usually can find a laundry which is much more reasonable than the hotel. I pack for a week and am usually gone for 5. Europe is harder to find laundries than other places, tho. Check the internet for laundries where you are going.