The first thing they tell you when buying a pass to enter the Laugardalslaug swimming pool in Reykjavik is that you must take a shower "without your bathing suit" before entering the pool. And if the verbal message isn't enough, the sign about greets you before entering the locker room.
Personally, I loved the explicit emphasis on cleanliness. I'm not a clean freak (in my opinion) but I find it strange that in America (and many other places, like Scotland, where we'd just visited before Iceland) people consider a quick rinse while wearing their bathing suit adequate preparation before entering a pool. C'mon people! We all know how dirty humans can get--especially in the areas highlighted in the above poster. I think the above sign should be mandatory at poolsides everywhere. 