Hand soap combines the scrubbing power of borax with the cleaning power of soap to easily dissolve grease and dirt when washing with water. This select blend is gentle on hands. Boraxo Powdered Hand Soap is 100 percent soluble and safe in septic systems. It won’t clog drains or harm fixtures and does not contain phosphates. Dual-action hand soap is made from 75 percent fine mesh borax and 25 percent soap for more cleaning power.