The answer to 'natural grout cleaner' is to use a homemade solution of baking soda and vinegar. Mix 1 part vinegar with 3 parts baking soda to create a paste, then apply it to the grout and let it sit for 5-10 minutes before scrubbing with a stiff-bristle brush. This natural cleaning method is effective at removing dirt, grime, and stains from grout without harsh chemicals.
For best results, apply the baking soda and vinegar solution to the grout, let it sit briefly, then use a grout brush or toothbrush to scrub the grout lines. Rinse the area thoroughly with clean water when finished. This natural grout cleaner can be used every few months to keep your tile and grout looking its best.