I used a brownie pan half full of water with 4 drops of dishwashing liquid stirred in (helps break the surface tension of the water so the fleas sink). Sat it in the floor with a desk lamp shining on it.
I would like to know how to get rid those pesty little sink/drain flies. I've tried baking soda and vinegar, drain cleaners and put plastic over the drains.
I used a brownie pan half full of water with 4 drops of dishwashing liquid stirred in (helps break the surface tension of the water so the fleas sink). Sat it in the floor with a desk lamp shining on it.
Worked like a charm!
Here is a good article on that. https://www.thebugsquad.com/fleas/flea-traps/
I always added some rubbing alcohol to this recipe. Works great!