I've tried all sorts of expensive conditioners, treatments and styling products. But the only time I really like my (long, wavy, frizz-prone) hair is after using the cheap Schwarzkopf box of dye that I've been using every 6 weeks or so during lockdown. I thought maybe it was the sachet of conditioner that came with the dye so bought a Schwarzkopf colour protect conditioner - no good. What's in the dye that's making my hair look healthy? What can I use in between that will have the same effect?