Hi I get a lot of build up in my hair and have come across two things that helped a lot. Years ago I bough a tea tree shampoo that removed a lot of build up. As I rinsed my hair after shampooing I saw like black lines of build up going down the drain. I think that using actual tea tree oil will work even better than this shampoo.

Just the other day I washed my hair with tomato past and was amazed in that it it became very flexible and soft and also seemed to remove some build up.

I am very impressed with the results after using the above on my hair as I have had problematic hair for a very long time.