Powdered rust stain cleaner; Mix the entire container with one gallon of water and a teaspoon of dishwashing detergent producing one gallon of rust stain remover that will cover approximately 400 square feet. Finished product has the same attributes as a gallon of the Liquid Rust Stain Remover. One container of Rid O' Rust Stain Remover will make 1 gallon of finished product.