Quote:
Originally Posted by DoubleF
I still have no clue what this means and I don't get the situation. What is on your tiles?
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Maybe they mean efflorescence, which is the white powder you get on concrete or bricks or whatever when there's water migration and it evaporates leaving whatever's in the water (salt?) behind.
If it's on outdoor tiles not sure where that'd come from.
Cleaning it the Internet suggests a mild acid but probably depends on what is actually being left behind.