
Joe on the serious side, these type of hair dyes are usually water based and on many occasions can be just extracted out,however due to the fact that you dont know the fibre or what she has attacked it with I would advise the following.
Before starting, rinse thoroughly to remove the residues of the customers assault and dry as much as possible.
Dab with something like Eco Spotter to tackle any oil content as some dyes use these as a carrier and blot with dry towel.
If you get any colour transfer from this then repeat procedure. If dye comes fully out finish with an acidic rinse.
For persistent dye staining there are three basic approaches.
1.Treatment as a tea/coffee stain.
2.Thermal transfer with something like Prochem RedRX or Chemspec Juice and Dye Remover or Eco spotter.
3.An oxygen bleaching treatment.
And in that order
