
Hi, on our stained parti colours we used to use neat fairly liquid, rubbed on to the stained hair only, left for about 10 mins and then owrked into a lather, conditioned and rinsed. Since we discovered the Whal All Out Purple shampoo we use this the same way instead. (had the advantage of smelling great too)
I do know someone who uses peroxide on parti colours, but it can cause serious coat damage (and I think it is against KC rules!)
bye
Gwen