Pour vinegar over calcium deposits to dissolve them. For heavier build-up, saturate a rag with vinegar, and place it around the fixture to soften the deposit. Use an old toothbrush to scrub the calcium away, rinse the fixture with tap water, and dry with a towel.
Many faucets have removable parts that facilitate cleaning. Remove shower heads and faucet aerators from the fixtures, disassemble them, and put them in appropriately sized containers. Pour vinegar over the parts, allow them to soak, and scrub away any scale. If the shower head is difficult to remove, pour vinegar into a plastic bag, put it over the shower head, and secure it with a rubber band.
The scale that forms on fixtures consists of many minerals that the water dissolves. While calcium is the most common, many tap waters also contain magnesium. As the water droplets left on the fixtures evaporate, they leave behind these minerals to form scale. Prevent the scale from returning by wiping the fixtures after use.
Scale builds up on sinks, tubs and toilets as the water evaporates from the porcelain. When the water includes soap, as in the shower, it becomes even more difficult to remove. Using a squeegee to wipe down shower walls after each use helps to prevent difficult-to-remove build-up from forming on the walls.