Please choose the correct solution to the question: To make a sponge last longer by killing the germs in it.

Solution1: Clean the sponge in the microwave. Make sure the sponge is wet and microwave on high for one minute to kill bacteria.

Solution2: Clean the sponge in the microwave. Make sure the sponge is dry and microwave on high for one hour to kill bacteria.

Answer format: solution1/solution2
Answer: solution1