Scented Fish Attractants not working???

Hi, lately I've tried out a fish attractant, "Fin Essence", which didn't do squat. I cast it out and the oils just disipate from the lure and I'm left with nothing. I even marinated rubber worms in the stuff for atleast a week and didn't even get a single bite. I'm going to try Berkley Powerbait B Attractant now. Is there any specific way I'm supposed to be applying this or are these "fish attractants" just a bunch of garbage?