Fill a jar, cup, or bowl with 1/2 cup apple cider vinegar
Add 1 to 2 drops of dish soap
Cover the top tightly with plastic wrap
Secure the plastic wrap with a rubber band
Poke small holes in the plastic wrap with a toothpick
Place the trap near flies
Replace the mixture every 2 to 3 days
Use a paper cone in a jar with fruit scraps as an alternative
Place ripe fruit or fruit peels in the bottom of a jar
Roll paper into a cone and leave a small opening at the tip
Put the cone into the jar with the narrow end facing down
Tape the cone to the jar if needed
Set the jar where flies gather
Empty and refresh the trap regularly