Laundromat are very popular in some countries but almost unheard of in others and, apparently, Iceland is such a place:
LAUNDRY: Self-service laundromats are not common in Iceland, but most hotels (typically 3-star or higher) throughout the country offer some laundry or dry-cleaning services for a moderate fee.
We saw one guesthouse that offered to do laundry - 2300ISk per load to wash and 2300ISK per load to dry. One load washed and dried would have cost well more than a night's accommodation there.
While I'm aware of the fact Iceland is somewhat expensive I'd rather avoid paying that much for laundry (let's say more than 800 ISK / 5+ Euros is that much).
I do not have a strict plan but suppose I'll need to wash my clothes far from Reykjavik, let's say somewhere around Ísafjörður or Akureyri or Höfn and my hostel doesn't provide any laundry facility (or it's super expensive, read above), how do I wash my clothes?
Is washing clothes in a hot spring really viable (as in legal AND environment-aware)?