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To determine acid sensitivity:
- Apply a drop of muriatic acid (swimming pool acid) to the underside of the material. The underside won't matter if it etches and is less likely to have a sealer on it that interferes with the test.
- If the drop fizzes, the material can be acid etched.
Still picture of acid fizzing on travertine limestone
Video of acid fizzing on concrete
If your material is acid sensitive:
- See Aldon "Grout Easy" before grouting to eliminate the need to clean grout residue with an acidic cleaner.
- If it is too late and you have stains from the grouting process - test with Aldon "Grout Restoration" at highly diluted strength.
For other cleaning and stain removal - use only Aldon "Insta-Clean". It is non-acidic and will not cause damage, but test first.