Child with really bad dandruff what shampoo??

[PinkBlossomTree]

Has anyone got any tried and tested recommendations for a really good dandruff shampoo?

Just washed dds hair who is 9 and it was so awful I had to rewash it thinking it was shampoo left in. But after a second really good wash with a very long time rinsing it's just as bad,

Nizoral - another vote for that.
Only one that works and also contain anti - androgen properties as well so it's been recommended for hair loss/ preventing hair loss.