Had ash highlights at the hairdressers six weeks ago. They were a bit too ash so I toned them down with a brown colour conditioner- well now that's faded out, it's light again but looking a bit green. I've not used any permanent or semi permanent colour on it. So what can I use on it that washes out but won't make it dark? I'm going to grow it out a bit as we are going abroad in the school summer holidays - so will wait till September to have roots done if I can bear it! Advice please