University field tests suggest that bright blue is the best color for lures, so I look for inexpensive disposable blue plastic items, then slather them with Tanglefoot or its generic equivalent.
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Step 1: Personal protection
When I operate motorized yard equipment, I wear the protective muffs that have a blue Solo cup attached to its frame with wire bag ties through two holes above the cup's rim.
Are they effective? All those dark dots are flies collected in just two weeks' use.
I discard the bowls and cups at the end of the fly season.