Safe & Effective Rust Stain Remover for Bathtub Surfaces

The user in post 1kysvik ("rusting bathtub help") mentions a "stain from a rusted shaving cream" on their bathtub and says, "I’ve tried charcoal toothpaste as well as foil, but none of them seem to work. Does anyone know how to get it off?" This suggests they need a cleaning product specifically designed to remove rust stains from delicate bathtub materials like porcelain, enamel, or acrylic without causing any damage. Such a product could be a non-abrasive chemical cleaner, perhaps in a gel, spray, or paste form, made for targeted application.

Expected Benefit: Moderate to High. Rust stains in bathrooms are a common and frustrating issue for many households. A product that effectively removes tough rust stains while being demonstrably safe for various sensitive bathtub surfaces would appeal to a broad consumer base looking for reliable and non-damaging cleaning solutions. This addresses a specific pain point that general-purpose cleaners often can't solve.