5 Star Stain Remover™ was formulated to be a powerful, easy-to-use carpet and cloth stain remover. It's the quick and easy solution for removing grease, oil and ground-in dirt. May be used on all types of carpet. Excellent for pre-treating stains prior to carpet shampooing. Add to your existing carpet shampoo to boost cleaning power. Contains biodegradeable surfactants. Will not harm plastic. Will not harm decorative finishes such as brass, bronze, copper, aluminum and chrome.