To effectively remove hardened grout from surfaces, you can use a grout removal tool, such as a grout saw or grout scraper, to carefully scrape away the hardened grout. Alternatively, you can try using a grout remover solution or a mixture of vinegar and water to soften the grout before scrubbing it away with a brush. It is important to follow the manufacturer's instructions and wear protective gear when using these methods.
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