De-Waxing / Winterization Dewaxing or Winterization is a process to remove solids (saturated glycerides or waxes) from oil. These solids cause cloudiness in oil at low temperature. This process is suitable for oils like Sunflower Oil, Cottonseed Oil, Corn Oil, Ricebran Oil etc which have wax contents more than permissible limit. The oil is mixed with filter-aid and is cooled at desired