These cloths are designed to REMOVE bacteria as opposed to KILLING it...When you clean with chemicals you are killing the bacteria but leaving a food source (residue) behind for the bacteria to use to grow back. Eventually, the bacteria becomes immune to these cleaners and that is why they are always having to come out with NEW AND IMPROVED products. Our micro fiber cloths are designed to remove bacteria from surfaces, and keep it locked in the fibers until you wash out your cloth with soap. This cloth effectively removes 99.94% of bacteria from all smooth surfaces. The silver in the cloth, prevents bacteria from growing in the cloth, and doesn't affect surfaces or skin in contact with it.