Flea Collars, Sprays, Baths and Bombing Don’t Work! I have owned pets for more than 40 years and up until a few years ago, fleas were always a huge problem. I tried flea collars, flea sprays and baths with flea shampoo. In my experience, those things just never (ever) worked. Maybe it reduced the number of fleas, but never once did any of these things eliminate the fleas. Not even the flea bombs. Here's what I found that actually WORKS! Get Rid of Fleas in House | Get Rid of Fleas on Cat