Scuba, for our September trip, it did not seem hard to find units with washers. But, we were in most locations only 3 or 4 days so we did not need a washer at each location. We never had a US style dryer. They were all the EU style, air dry rack. In one city we simply went to a laundromat. It took a few minutes to understand the foreign language directions, but we managed. And, locals offered help. We went to the local cafe and had a coffee while the clothes were finishing. Security cameras were in the laundromat. If your unit does not have a washer, Laundromats work well.
Yes, we considered going to the laundromat but it was just so much less time-consuming to wash a sink load every few nights that we stuck with that. Next time I will try the filtering and see what we can get with a washer, but I’m a bit concerned about limiting ourselves with that as a requirement.