The Sunburst SRS consists of three stain-removing products, each with distinctive stain-removal properties. SR1 is an oil-based formula for removing oil-based stains: Environmentally friendly, it contains no hazardous chemicals; Use it before or after the washing process for quality results. SR2 is a general-purpose spotter used for removing a broad spectrum of stains: Environmentally friendly, it is safe and easy to handle. SR3 is a concentrated product for removing rust and iron stains: It contains no hydrofluoric acid, is safe to use, and is environmentally friendly. Kit includes: Two of SR1 Oil Based Stain Remover, one of SR2 General Purpose Spotter, one of SR3 Rust & Iron Stain Remover.