What Hand hygiene product with the least activity against microbes?

Among hand hygiene products, plain soap and water exhibit the least antimicrobial activity compared to alcohol-based hand sanitizers or antiseptic soaps. While plain soap effectively removes dirt and some microbes through mechanical action, it doesn't have the same level of germicidal properties as those containing antimicrobial agents. However, it is still effective in reducing the overall microbial load when used properly.