About 3 years ago we brought fleas home from someone else's house. My son was about 20 mo at the time and I couldn't find anything that worked that was okay while he was there. I ended up getting the flea bombs, then vacuumed a few times, used my carpet cleaner (one of the machines) with only hot water (the soap often stays in the carpet-per my husband who used to clean carpets 40 hrs a week!, and I wanted the chemicals gone-didn't want to add any). Then I just wiped everything down with a chlorox or lysol wipe. Even having two dogs still didn't bring ANY fleas back, and no one got sick, plus the house looked great, and I didn't have to worry about whether it was working or not.