"Never use anything anti-bacterial. If it kills, say, 99.9% of germs, only the .1% strongest are left to multiply. Not good."

Nonsense, I'm afraid. These products, used properly, kill all germs. The manufacturers, however, can't make that claim because there's always the chance of someone misusing their product who will catch the germ then blame the product. The manufacturers are simply covering their arses. In the olden days we had ads for a bleach that claimed that it killed "all known germs." Note the variation on the caveat. I'm an atheist, as much as anyone is an atheist. But I'm only 99.9% certain that there's no God. Same kind of thinking.