Question 6: There are many types of hair creams. Do creams and other hair products made of a viscous substance prevent water from reaching the hair, and what then is the ruling on Wudoo’ (ablution)? Please advise, may Allaah reward you!
Answer: The types of cream that have a density which prevents water from reaching the skin should be removed prior to Wudoo’. On the other hand, those types which have no density do not have any effect on the validity of Wudoo’… read more here.