Many people make the mistake of using aggressive and abrasive cleansers on your porcelain bathtub. Generally, there is the idea that the resilient nature of the porcelain will leave the tub resistant to scratches, breakage and stains. As much as she resists stains well, you will find, over time that aggressive cleaning agents will pierce the surface of the bath and disfigure it.
Instructions to clean porcelain bathtub: brush the maximum amount of lime in the bottom of your bathtub. Rinse the tub with large amounts of clean water. Mix two tablespoons of detergent soup with five cups of water. Rinse the cloth in a diluted cleaning solution and scrub the bathtub.
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Mix a sufficient amount of sodium bicarbonate in water to create a thick paste then pass this mixture over the entire bath. Rinse the porcelain bathtub thoroughly with clean water to remove the cleaning and lime. These mixtures will also remove soap scum, dirt and soot.