A childhood belief about adverts

One time when I was small I was watching t.v. with a mother and an add for a beauty product came on. I wasn't interested in getting the beauty product being a little kid, but I made some comment about how it "looked good." My mother, in an attempt to make me think more realistically when viewing commericals, explained that you couldn't always believe advertisments, especially since the companies just wanted to sell their products. But instead of becoming more open-minded, I took her quite literally and I was under the impression that anything advertised on t.v. had to be total crap. I figured that sensible people, like my parents for instance made sure not to buy products advertised on t.v. I was quite shocked to find some Mr. Clean under the sink one day . . . how could my parents expect it to be any good? It was always on television!