Use this ready-to-use formula Bar Keepers Friend 11637 26 Oz. Soft Cleanser to quickly coat hard, non-porous surfaces with ease. This cleanser is particular useful for cleaning vertical surfaces in the bathroom, such as shower stalls, bathtubs, and toilets. Once you squirt a horizontal line of BKF Soft Cleanser onto a vertical surface, gravity will cause the line to sheet downward into a uniform coating.
This BKF Soft Cleanser is effective at removing rust stains, metal tarnish, mineral deposits, soap scum, and everyday grime. To reduce the amount of rinsing, try using less BKF than you think you need. A little goes a long way.