Deep-Acting Mildew & Mold Remover for Caulk/Grout

Users repeatedly express frustration with persistent mildew and mold beneath or within bathtub caulk and grout that regular bleach and cleaners cannot remove. They resort to entirely stripping and reapplying caulk, which is a significant effort. A specialized, easy-to-apply product or system that deeply penetrates and effectively eliminates embedded mildew/mold without requiring extensive re-caulking would address a common and difficult household problem. This could be a gel, foam, or spray with specific surfactants or enzymes targeting the mold spores in porous materials, or a kit that facilitates targeted cleaning and mildew-resistant re-caulking.