Things You Will Need
A mildly abrasive cleanser with bleach can lighten stains and remove buildup without harming the porcelain bathtub's finish.
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Rinse the porcelain tub thoroughly with warm water.
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Apply a mildly abrasive bleach cleanser to the stains. Allow the product to sit for at least 10 minutes.
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Clean the tub with a wet scrub brush or sponge, paying special attention to the stained areas.
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Rinse the bathtub thoroughly.
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Dry the tub with a towel. If stains remain, repeat the cleaning process.