@roadrash I use a product called Bravecto, from the Vet, only because my cat has allergies, the Vet recommended it.
Suits me, as it's a spot on type of product that needs applied only every 12 weeks (instead of every 30 days like with Advocate and similar).
Previous cats I had were flea free with Advocate no probs.
As said up thread, don't use Bob Martin products, they are not effective.
It's important to de-worm outdoor cats every 3 months, as flea and worm eggs can be ingested with small rodents or birds.
If the cats have not had fleas, ever, you don't need to treat your home with pesticides.
It's good practice to change the flea repellent brand from time to time, because fleas can built an immunity.
