There is also the "physical washing" method developed by biotechnology companies: just as petroleum is turned into petroleum-based products, orange and coconut oil are turned into natural surfactants that are environmentally safer. To them are added edible minerals and trace elements, and the end product can be used as a cleanser.
也有生技公司開發所謂的「物理洗淨法」，就如一般石化類產品是從石油中衍生出來的，部分以環保為訴求的產品則以天然的橘子油、椰子油為界面活性劑，再加入礦物質和微量元素等可食用的成分為原料，同樣可以達到清潔效果。