If your grout is in need of a particularly deep clean, you can apply the toothpaste like a face mask instead.
Layer it on the gaps between your tiles and leave to sit for an hour or so.
The toothpaste will harden over time, but this can be easily removed with a lemon juice solution.
Squeeze a little lemon juice in a bowl with some warm water and use a clean cloth to cover your index finger.
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