Quick Overview: Prochem Rust Remover eliminates rust stains from carpets and upholstery fabrics caused by metal touching cleaned, wet fabrics. Time-released and Fluoride-based, this unique thickened formulation is safe to use. Its flexible squeeze-bottle container allows you to apply Rust Remover directly onto the stain safely and effectively. Features: Time-release system for safe and effective rust removal Gelled formula keeps product in contact with rust spot Safe for use on carpet and most upholstery fabrics 1. Apply Prochem Rust Remover directly to the rust spot. Avoid over-application. 2. Allow 10-20 minutes of contact time. Agitate gently during dwell time with a brush or scraper(do not use fingers). 3. Blot or extract area with clean water or cleaning solution. Note: Old or large rust spots will require longer contact time than recent rust spots. Gentle agitation speeds rust spot removal.