Wash less aggressively than you think you need to
Clarifying shampoos have their place, especially if you live with hard water or use a lot of dry shampoo, but grey hair dries out faster than pigmented hair and punishes over-washing. If your lengths feel like straw while your roots get greasy, shampoo the scalp only and let the suds rinse through the ends.
Purple and silver shampoos deserve a word of caution. They're toning products, not conditioning ones, and used too often on porous grey they can leave a flat lilac cast that reads dull rather than bright. Once a week or once a fortnight is plenty for most people, left on for far less time than the bottle implies, with a conditioner afterwards. If yellowing is stubborn, a salon gloss or toner will do a cleaner job than escalating at home.
The cut does more than any serum
Coarse grey hair fights blunt, heavy shapes — the weight sits in a solid line and the ends flick outward in whichever direction they please. What tends to work is a shape with movement built in: soft layers that let the hair bend, a length that falls somewhere between the collarbone and the shoulder, and ends that are trimmed often enough that they don't fray. Fine grey hair has the opposite problem and usually wants a shorter, blunter cut to look dense.
If you're growing out colour, ask for the cut to be revisited more often than usual during the transition. The demarcation line is far less noticeable on a shape with movement than on one solid length.
