Please choose the correct solution to the question: how to remove stains from marble

Solution1: Mix a few drops of ammonia with 12% hydrogen peroxide to spot clean the stained area. However, be careful when using this method on darker stones as the hydrogen peroxide can lighten the color of the marble.

Solution2: Mix a few drops of ammonia with 12% hydrogen peroxide to spot clean the stained area. However, be careful when using this method on darker stones as the hydrogen peroxide can darken the color of the marble.

Answer format: solution1/solution2
Answer: solution1