Search "clean the"

Vetiver essential oil, also called khus oil, is extracted from the vetiver plant, a clumpy, green grass native to India that can grow five feet high or more.  The root system, where the essential oil comes from, is massive, deep, penetrating, tough, and can grow to 7 meters deep in 36 months.  This feature provides vetiver with an extremely strong anchor to the soil, which is vital in erosion