Clr Pro Commercial Probiotic Cleaner Removes Tough Soils And Provides Up To Three Days Of Cleaning Power, As Probiotics Remain On The Surface For Up To 3 Days. This Bleach-Free Formula Is Made Of Bio-Based Ingredients And Leaves Behind A Fresh Lemon Scent. Multi-Purpose Solution Is Effective On Over 30 Surfaces, Including Grout, Chrome, Aluminum, Fiberglass And Stainless Steel.