Cleaning the bathtub – list shows the best home remedies. Citric acid is also ideal for descaling the tub.
Clean the tub with baking soda, laundry detergent and dish soap. Dishwashing tablets are particularly useful to remove discoloration and limescale. A well-draining drain and proper ventilation throughout the bathroom are important. If you don't use your bathtub at all because you have a separate shower, you can at least be annoyed by dust deposits.