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To eliminate them, it will be necessary to spray the affected surfaces, that is, those of the shower cabin or sink, with a mixture of water and white vinegar, of the same size. Then let the solution sit for a few minutes and dry with a spatula. Finally polish, using an antistatic cloth . The result will be exceptional.
A second remedy always consists of water and vinegar, but adding a few drops of dish soap or Marseille soap. They are mixed and applied to the tiles with a sprayer. Then scrub it with a non-abrasive sponge and rinse, simply with hot water. At the end of the procedure, dry with a dry cloth.
Then you take a toothbrush, prepare a glass with baking soda and another with hydrogen peroxide. Lightly wet the powder with drops of hydrogen peroxide, dip it in the toothbrush and rub the joints well. A few super vigorous strokes are enough to leave them practically like new
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