Try this it works!!!

[deerock]

the gnats and mosquitos were making life unberable hanging by the dock in the evenings. Whether on the boat or at the dock. I filled a spray bottle with listerine and sprayed the boat deck with it. llso sprayed the dock around us sitting around. Gnats and mosquitos "bugged" out its alot cheaper than all the OFF type bug repellents.

 

[rondds]

Which color? Interesting. When it was first introduced, Listerine (the yellow stuff) was advertised as a sort of wonder elixer - cured colds, sore throats, etc.

I guess we'll all have to try it for ourselves, though...
SNOPES