Please choose the correct solution to the question: Clean scale of the inside of a tea kettle.

Solution1: Place a mixture of 50 percent vinegar and 50 percent water into the kettle. Switch it on and let it boil.  Cool, the remove the mixture.  Give the inside a wipe with a cloth, rinse and done.

Solution2: Place a mixture of 90 percent water and 10 percent alcohol into the kettle. Switch it on and let it boil.  Cool, the remove the mixture.  Give the inside a wipe with a cloth, rinse and done.

Answer format: solution1/solution2
Answer: solution1