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This is one just for the record. Formula provided by Ray Wooff who headed up Tsetse fly control in Uganda (and collected Tabanids) so I'm guessing it kept pests away when working in hot climes.

Water 93cc
Ethyl Alcohol 5cc
Phenol 2g
Pour into sand in the bottom of a jar and leave specimens for 2 days.

I have noted that specimens in collections treated this way are avoided by pests.

Academic if you don't have access to phenol which I have a jar of and is frankly the most horrific substance I've ever had to handle. It breaks up into tiny airborne spicules which react with exposed skin and burns.