If your grout turned red, skip the bleach and use this everyday staple instead
The Spruce: Shanina Knighton, research associate professor at Frances Payne Bolton School of Nursing, noted that red grout stains are often caused by Serratia marcescens bacteria. She recommends using hydrogen peroxide over bleach, noting it’s safer and more effective at breaking through biofilms. “It’s odorless, less corrosive and still highly effective,” she said.
