take a small drill bit and drill a hole in the bottom, drill it close the the plastice lense so its not see-able. then take a vacuum or shop vac and suck out the water and to help air dry the inside, do that for a few minutes then let them sit in the sun for a while.

I just did that and have not had a issue since, I can snag a pic of where I drilled the hole if ya need one.