10 Ways...

"I can tell when all my blondes—Kate Hudson, Scarlett Johansson, Uma Thurman—have spent a lot of time in the pool because their hair gets a faint green tinge," says L.A. hairstylist David Babaii. Sound familiar? Try using a detox shampoo and conditioner (like Fekkai Marine Clean Detox shampoo, $23; fekkai.com.) for a couple of weeks to eliminate the residual offender.