Acidic cleaners are cleaning products that contain acids, which help break down tough stains, mineral deposits, and grease. Common acids used in these cleaners include citric acid, acetic acid, and phosphoric acid. They are often effective for cleaning surfaces like bathrooms, kitchens, and tiles where hard water stains and soap scum can accumulate. These cleaners work by lowering the pH of the surface being cleaned, which helps dissolve unwanted substances. While they are effective, it's important to use them carefully, as they can damage certain materials, such as natural stone or metal, if not used properly.