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4. In extreme cases, water and bleach
If the natural alternatives listed above do not give satisfactory results, there is only one way out: use bleach.
Wear gloves and pour 3 or 4 tablespoons of bleach for every liter of water. Use the solution to scrub between the joints with an old toothbrush and, after about ten minutes, wipe with a clean cloth.
Keeping your floor spotlessly clean and removing dirt between the joints is easier than you might think: immediately apply the tips described above to restore the floor to its original appearance.