About 5 or 6 years ago, our cats brought in a massive flea infestation. We tried for 2 months to get rid of the fleas, but it was almost impossible. Then we discovered flea traps.
A rectangular plastic plate about 10”x8” with an elevated cover wwith a small light bulb. The lower part has a sticky sheet of glue impregnated with flea pheromones. Put the trap in a room and turn on the trap’s small light (heat source). In an hour check the trap and there will be 50 or 60 of the biting pests stuck to it. A few days later and you’ll wonder where all the fleas came from and how they managed to find a place on the glue pad to stick themselves. The traps usually cost about $15 and replacement sheets of pheromone stick stuff are a couple bucks.
Fleas are attracted to the light and heat and will leap at it. The soap in the water makes them sink right away and they die.
The number of dead fleas will eventually drop to the point that no new dead guys will signal infestation is over.
Refresh water every day.
DIY with a shallow tray of water with a few drops of dish soap added and a small lamp suspended over the tray.Same principle they head for the lamp land in the soapy water and sink
Works great