Vitamine B6 does not work. At least not for us. Off deep woods works good for Mosquitos.
Nothing worked for Sandflies but that was in Honduras. Maybe the Belize type is not as nasty. We will test oil against them this June. Do you guys think Suntan oil that smells like Coconut will work? Baby oil in the sun is a sure sun burn. Do Sandflies come only out at dusk on AC?