Dry skin is not because of lack of grease or skin oils rather its because of lack of water.
Although bathing frequently with out moisturization leads to dry skin,it is now recognized that bathing once or twice daily with postbath application of emollients to damp skin can improve the water content of skin and aid in the prevention and treatment of dry skin.Bath water should be warm but not hot.Bath oils may be added.However,these may make slippery and difficult to clean.An alternative is to add one tea spoon of oil to one quarter cup of warm water and use the mixture as a rubdown either after a bath or a substitute for bath.