Pet-Safe Shower Mildew Prevention Spray/Coating

A user has new mildew in a recently renovated shower, identifying the core problem as inadequate ventilation (as pointed out in comments). They need an immediate, effective, and pet-safe solution for both cleaning and preventing mildew recurrence without major renovations. While pet-safe cleaners exist, a long-lasting preventative spray or coating specifically designed to inhibit mildew growth in high-moisture, low-ventilation environments, while being guaranteed non-toxic for pets, would address a significant gap. This product would reduce cleaning frequency and provide peace of mind for pet owners until underlying ventilation issues can be addressed.