Blythe Doll Hair Treatment/Spa

Of all the Blythe doll hair treatments I’ve tried, this method gives me the best results! So I thought I’d share it for anyone who’s interested 😊
Which methods do you use?
Products I use:
-washing up liquid (preferably in a clear or light colour, to prevent colours staining)
-Son of a Gun protectant for vinyl and plastic - you can get this is most places that sell car accessories
-wig brushes