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Squeeze a lemon and add baking soda until you make a thick creamy paste, leave on for up to 20 minutes and rinse with cold water.

Squeeze one whole lemon and add a tablespoon of baking soda until you make a thick creamy paste. Leave on for up to 20 min, then rinse with cold water. Make sure you make a thick creamy paste. If it's too watery, add more baking soda.