Here's how to use and apply an ammonia and baking soda solution to remove tub rings: Combine half a bucket of water with 1/4 cup of ammonia and 1/4 cup of baking soda. Use a non-abrasive sponge soaked ...

Alex Knapp is a Forbes senior editor covering healthcare and science. Ammonia is a crucial ingredient for the planet’s food supply—more than two-thirds of it is used to produce fertilizer. It’s also ...