You need:
Half a glass of baking soda
Half a glass of vinegar
Pour baking soda into the sink, making sure to get a good amount of it down the drain. Then pour in the vinegar, which when it comes into contact with the baking soda will generate an effervescent effect.
At this point, you can take advantage of it and use a sponge to clean the inside of the sink: the combination of vinegar and bicarbonate is very effective in removing dirt, disinfecting and making the metal shine.
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