I've tried another technique which basically just uses shampoo and baking soda. It's something you'd do once a month to cleanse your hair from chemical build up. Outcome of which would bring back the shine to your hair.
So here's what you do: put half the amount of shampoo that you regularly use and add baking soda to it in the same amount. Lather and shampoo on your hair. Best to use warm water first to wet your hair then rinse with cold water.
Now that's definitely not "shampoo lang yan" =)