Please choose the correct solution to the question: Remove coffee and tea stains from inside of cups.

Solution1: Sometimes scrubbing tea cups and mugs doesn't remove all the stains. Take a bit of baking soda on a damp cloth and apply to the outside of the cup. Rub gently, and the stains will disappear very quickly.

Solution2: Sometimes scrubbing tea cups and mugs doesn't remove all the stains. Take a bit of baking soda on a damp cloth and apply to the insides of the cup. Rub gently, and the stains will disappear very quickly.

Answer format: solution1/solution2
Answer: solution2