Sometimes when the Rugged rukus is exposed to water, a small amount of water may condense between the clear polycarbonate solar panel cover and the solar panel itself. This may appear like small blotches on the solar panel. While this is a cosmetic issue it is not a performance issue and you can rest assured that it will not damage the product. There is, in fact, a second water barrier formed between the solar panel and the electronics chamber below.
If you allow the Rugged rukus to sit in the warm/hot sunlight the water will eventually evaporate from between the solar panel cover and the solar panel with no harm being done to the speaker.