สารชะล้าง both types are gentle. Not significantly different the rest of the gist To make the formula gentle? Depending on the rate of use, the formula is more สารกันเสีย Gentle Introducing Mild Preserved Eco or Phenoxyethanol SAสารชะล้าง If you want a more gentle one, use Lauryl Glucoside or sodium cocoyl glycinate/ glutamate Good