Turn up the lights in your shower. In just one wash, Sheer Blonde Go Blonder In-Shower Lightening Treatment instantly softens dark roots and lightens blonde tones for natural, shimmering colour from root to tip. Instantly lighten your look. The John Frieda Sheer Blonde In Shower Lightening Treatment is a two-phase product made of a high pH surfactant activator, and a low peroxide developer.