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A couple years back I purchased a head net to escape hydrilla gnats on Lake Seminole while fishing the summer months. The only problem was the heat. I think I'd rather compete with the gnats than sweating under a head net. Then I learned from a couple of locals that Downy Fabric Softening Dryer Sheets were very helpful in keeping these pesky rascals at bay. Take a sheet and lightly dab your face and forehead. Then stick the sheet somewhere close to your face - like partially secured in your hat or tucked into the top of your shirt. This works - give it a try. Gnats will come on in, take one sniff, and run to your fishing buddy at the other end of the boat
They don't have to be Downey brand, I use the ones from the dollar store!
Swede, my gramma has been using dryer sheets on the screen doors at her house to keep the bugs from trying to come in.......works great......