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There are a number of commercial acid-based cleaners available from masonry dealers or "big box" home stores. Follow the directions carefully.

Consider the application of something like silane- or siloxane-based sealer. Check it out when you go look at the cleaners.

Another safer way would be to use a mild acid solution first such as white vinegar. This has been proven to work and is not toxic. See below for step by step guide...

Natural Formula to Use:

½ liter white vinegar and ¼ liter of water

Method to Use:

1.Fill a clean spray bottle with pure vinegar

2.Spray the vinegar/water solution over the brick and wait for a few minutes

3.If stains are stubborn spray more solution and wait a while longer

4.Scrub lightly with a stiff brush and rinse

Tip:

Try to deal with the water spots straight away as the solution works best with newly formed or mild hard water spots. It is also a good idea to use gloves to prevent the strong smell of vinegar staining your hands and clothing.

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