If you're dealing with hard water and suffering from build-up, it can be tempting to wash every day, but that's not really the best option. "I think it's best to wash less. Keep some of those natural oils," says Watts. "Try to use a cleansing cream rather than a bubbly foamy shampoo. It's a hard one to sell to people that want to feel clean and see bubbles, but stripping hair of all it's goodness with the big bully of hard water is double trouble."
We really like Kerastase Bain Divalent (£15) for a cleansing wash that gets rid of build-up without feeling heavy, or go completely natural with an oil-based cleanser for the hair, like Hair Story New Wash (£44).