Flea Trap
Listener tip:
“At night my mother-in-law places a cool-whip container of water with 1 drop of dish washing soap on the floor under a nite light. (add the soap last to avoid bubbles) The next morning you can collect your trapped fleas. Does the trick and is kinda fun, too!”
— T.W.
Wikihow: How to make a flea trap (but ignore their advice on toxic chemicals.)