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White marks on new porcelain patio

Discussion in 'In the Garden' started by Joehasapatioproblem, 17 Jan 2021.

  1. Joehasapatioproblem

    Joehasapatioproblem

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    Hi!

    Hope to get some advice on a problem..

    Had an outside patio layed 3 months back. Marshalls Symphony Black which is a vitrified porcelain slab. With brush-in jointing compound on a solid concrete bed.

    About a month after it was laid I cleaned it with a mixture of warm water and fairy liquid using a stiff brush.


    It's begun to develop white staining over the past few weeks which looks incredibly unsightly!

    I've tried a couple of products on the advice of Lithofin to clean it:

    Lithofin Intensive Cleaner
    Lithofin Ceramic Clean

    But neither seem to be getting the marks off!

    Does anyone have any idea what it might be?


    Many thanks.
     
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  3. Bonni

    Bonni

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    Is it salts? Washing up liquid contains salt. Mortar cleaning acid from a builders merchants might do the trick.
     
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