Each material, presents its particularities, and therefore also requires specific products.
Marble and porcelain are thoroughly cleaned with a mixture that is very easy to prepare. In half a liter of hot water, add half a cup of vinegar, a cup of ammonia and a quarter of a cup of baking soda. Rub the surfaces with a sponge soaked in this solution and rinse thoroughly with water. The most stubborn stains are removed with a turpentine and white alcohol preparation, then rinsed with hot water.
For slab and ceramic bathtubs, wipe with lemon oil and dry with a clean cloth. This method is useful for removing minor spots. If these persist or are very dark, resort to spraying baking soda on them and rub vigorously with a dry cloth. Try to remove possible dirt anchored in the cracks.
On the other hand, the acrylic bathtubs (material of the bathtubs with hydromassage) must be cleaned with non-abrasive detergents, so that the shine does not disappear. Special chemical products are marketed for this material, as well as for fiberglass tubs.
TRICK: To polish the bathtub. Prepare a solution with a glass of vinegar and two tablespoons of salt, you must rest all night. Next we will clean the bathtub with it.
TRICK: To whiten the bathtub. Rub with a solution of water, salt and turpentine, for sale in drugstores.
When the rust spots are very pronounced you should use a mixture composed of borax and lemon juice, rubbing vigorously.