The secret to sparkling clean grout is in your tool kit - House Digest

First of all, it is important to choose a fine grit sandpaper, ideally 200 grit or more, so as not to damage the edges of the tiles. Fold the sandpaper in half to create a fine sanding edge and gently sand along the grout lines. Be careful to remove only the top layer of dirty grout; Sanding too deep will expose the edges of the tiles and cause more problems. The new grout underneath will be bright white. Therefore, for consistency, you may need to paint the entire area and not just a few small spots.

After sanding down any necessary grout, vacuum up the dust, wipe the tiles with a damp cloth, and then wipe with a dry microfiber cloth. To protect grout lines from further damage, immediately apply a grout sealer specifically tailored to the tile and grout type. In addition, cleaning tiled surfaces after each use goes a long way to preventing future stains and wear.

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