I have poker straight mouse-brown hair which I have hi-lighted for years (or at least my hairdresser has) which tends to lean towards greasy if allowed. Been going very slowly grey for about 18 months ish (I'm 50).
Since the start of this year it's been getting increasingly frizzy after dog walks in the morning even when it's not noticeably damp and my hairdresser has gently explained this is because of the greys 
so can anyone recommend a product that will keep it smooth (or at least smoother) please? Tia