No matter what kind of insecticide they use, every time I've had contact with those bug foggers they left an oily film that smelled like kerosene. It's probably some kind of petroleum distillate, so it will coat the surface of any standing water and not evaporate quickly. I should think they probably use the same (primitive) technology over there. 
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The descent of man ~ Nixon, Friedman, Reagan, Trump.
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