‘Double shampoo’ is trending – here’s why celebrity hairdresser Sam McKnight thinks you should be washing your hair twice…

u2018Double shampoou2019 is trending u2013u00a0hereu2019s why celebrity hairdresser Sam McKnight thinks you should be washing your hair twiceu2026

u2018Double shampoou2019 hair benefits: plus, best products

‘Double shampoo’ hair benefits: plus, best products

Best formulas for double shampooing your hair