I'm in Rio de Janeiro and have a very micro size but that is clear and looks like a moving blob. It seems to resist most sprays and just keeps coming back. It is only on one tile wall of a complely white tile bathroom. It's also the wall that a flourescent light is laying against and they seem to be attracted to the light. The picture was from a fairly high res camera but they are so small it's hard to get a good view of them. This area is also up against a forest.