My BB has 頭泥 since he had 3 months old. We used Baby Oil and Oliver Oil to massage his head but the effect is not good. Then we bought a shampoo at Jusco (black colour) and washed the head everyday, then he has no more 頭泥. He is now 7 months old. But please remember, 頭泥 is very common and will be disappeared when BB growth up.