Answer
Test a small area before and after with a soluble-salt (Bresle-type) test; rewash and retest until the target level for the coating system is met.
Detailed question
How do I know the salts are gone?
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RXSOL CHEMO PHARMA International Navi Mumbai, India
Try "boiler water treatment", "tank cleaner" or a chemical name such as "citric acid".
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Test a small area before and after with a soluble-salt (Bresle-type) test; rewash and retest until the target level for the coating system is met.
How do I know the salts are gone?