Stain repellents are special treatments applied to fabrics, carpets, and surfaces to help prevent stains from setting in. They work by creating a protective barrier that makes it difficult for liquids and dirt to penetrate the material. Commonly used in items like clothing, upholstery, and rugs, these repellents can be found in both spray and liquid forms. Many stain repellents are made from fluoropolymers or silicone-based compounds, which are effective at repelling water and oil-based substances. Regular use of stain repellents can prolong the life of items and keep them looking clean and new. However, it's important to reapply these treatments periodically for optimal effectiveness.