Most dangerous flea and tick products

Many people are using safe Down dishwashing liquid and little vinegar to wash cats and kittens to control fleas instead of using deadly highly toxic products.
To control fleas and ticks in house and outdoors, ceder oil products are available on internet.

I have used Dawn on an orphan kitten that was too small for anything else. Other than that I used to use Frontline then switched to Revolution. I switched to Revolution because it also has the dewormer in it. I have never used any of the other things including collars. As far as I know other than the occasional allergic reaction both Frontline and Revolution are safe for healthy cats.