Bacteria are good at making babies.

So next time you see an advert claiming the product removes 99.9 per cent of bacteria, talk to a microbiologist who will say that’s a 3-log reduction, we look for 5-7 log reductions.

Maggie Fox of NBC News reports the U.S. Food and Drug Administration says antibacterial soaps do little or nothing to make soap work any better and said the industry has failed to prove they’re safe. Companies will have a year to take the ingredients out of the products, the FDA said. They include triclosan and triclocarban. Soap manufacturers will have an extra year to negotiate over other, less commonly used ingredients such as benzalkonium chloride.

“Companies will no longer be able to market antibacterial washes with these ingredients because manufacturers did not demonstrate that the ingredients are both safe for long-term daily use and more effective than plain soap and water in preventing illness and the spread of certain infections,” the FDA said in a statement. “Some manufacturers have already started removing these ingredients from their products.” Triclosan used in 93 percent of liquid products labeled “antibacterial” or “antimicrobial” – at least 2,000 different products, according to the FDA. “Consumers may think antibacterial washes are more effective at preventing the spread of germs, but we have no scientific evidence that they are any better than plain soap and water”.

In 2013 FDA gave soap makers a year to show that adding antibacterial chemicals did anything at all to help them kill germs. It made the rule final Friday.