Remove all removable cushion covers and wash them in hot water with a cup of vinegar added to the cycle. Vinegar breaks down flea egg casings and neutralizes the smell of pet dander that attracts fleas. If you have throw blankets or pillows, toss them in too—any fabric touching the couch is a potential flea Uber.
Non-removable covers? Spritz them with a mix of white vinegar and water (1:1) and let them air-dry in the sun. Sunlight is a natural flea repellent, but good luck finding it if you live in a cloudy city.
