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White marks on new shower floor grout! What should I do?

5 years ago

Looks like efflorescence. The grout was installed last week in my new bathroom and is still unsealed. The shower hasn't been used yet (though it has been turned on just to test the valve connections, drainage, sloping, etc).

I'm hesitant to use any chemicals because I don't want to risk further staining of the grout. Should I just scrub it with hot water, let it dry, then seal?

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