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

Solution1: Mix equal parts distilled white vinegar and soda in a bottle and spray it generously onto tiled surfaces. Allow to sit for a few minutes before scrubbing with a brush or sponge. Extra tough stains may require the combined action of baking soda and vinegar.

Solution2: Mix equal parts distilled white vinegar and water in a bottle and spray it generously onto tiled surfaces. Allow to sit for a few minutes before scrubbing with a brush or sponge. Extra tough stains may require the combined action of baking soda and vinegar.

Answer format: solution1/solution2
Answer: solution2