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Pour 1 glass of cold water and 2 drops of hydrochloric acid into a plastic cup and mix well.
Apply the mixture to the dirtiest parts of the bathtub using a brush or a scrub brush and leave it on for a few minutes.
Then scrub with a cleaning brush and rinse thoroughly with cold water.


Bathroom cleaning – Source: spm
Whitening
If your bathtub has visible black stains in the corners and around the faucet, you must clean them very quickly, as these are mold stains that can be dangerous for your health! In this case, bleach is the best disinfectant to completely eliminate this mold. It’s a staple of the household universe that you probably already have or can easily find in any supermarket.
Preparation