It’s the dispenser not the soap. People have to touch the dispenser to get to the soap within. I guess most of them do not prewash their hands before doing this. I’m sensing an agenda here. Common sense will tell you that once you use the soap and rinse and dry any germs from the dispenser knob will be gone. Did they test the hands of people who had just used the soap?
Liquid soap is usually made from a concentrate that’s diluted with tap water and poured into smaller containers used to refill the soap dispensers. Some cleaning companies may be diluting that concentrate more than recommended to save money, making them less effective against germs.
Gerba found one supplier who was reusing a 30-gallon barrel to mix the soap, and discovered “at the bottom was a half-inch of slime” that no one knew how long had been there.
Commercial soaps contain preservatives designed to inhibit the growth of harmful microbes, but scientists suspect that those preservatives break down over time. And it doesn’t seem to matter whether the soap dispenser is made out of plastic or stainless steel.