Dark Grout: Causes and Restoration Options for Homeowners

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Dark grout in showers and kitchen backsplashes is a common eyesore that often signals trapped dirt, soap scum, or moisture issues rather than permanent damage. For homeowners, understanding the difference between surface staining and deeper mildew growth is key—bleach-based cleaners can help lighten stains, while restoring original color may require professional re-grouting or sealing. If the grout feels brittle or crumbly, it might be failing completely, making replacement the best long-term f…