What began as a polish for brass rails in turn of the century taverns, Bar Keepers Friend Cleanser & Polish has become the premium house-hold cleanser. Using a non-bleach, plant based cleanser plus scrubbing micro particles, BKF attacks tough stains from two directions. The oxalic acid, found in plants such as rhubarb, attacks hard rust and lime stains at the molecular level, breaking up the bonds that hold them together. Once those bonds are broken, the micro scrubbing particles move in to finish the job, polishing as they remove deposits. This 2-stage method of cleaning is why Bar Keepers Friend is so popular for cleaning nearly every surface in your home, garage, patio, or workplace.