Question: how to remove stains from ceramic tiles

  Options: 
 A. 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.
 B. 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: B