Which Shampoo Works Best on Blue Roans?

[Sabrina&Stardust]

Hey Guys, my shampoo has almost run out for my pony so I need to buy another. He's a blue roan & doesn't have very sensitive skin so I wanted to try a few different shampoos to find one that will really show off his colour. Any recommendations? Of course I'll do a test patch first so I'm quite happy to try human shampoos.
Thanks!

 

[arizonahoney]

I'm a big fan of Exhibitor Labs products - experiment with Quic Silver or Quic Black...