Bar Keepers Friend Soft Cleanser 737gm It 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. Like BKF Powder, BKF Soft Cleanser is effective at removing rust stains, metal tarnish, mineral deposits, soap scum, and everyday grime. Both require thorough rinsing. To reduce the amount of rinsing, try using less BKF than you think you need. A little goes a long way. How to use BKF Soft Cleanse Shake well before using. Squeeze BKF onto wet surface or damp sponge. Rub onto soiled surface. Rinse thoroughly within one minute of application. Wipe surface dry.