I used to buy an expensive cleaner that promised to remove calcium and other deposits. It worked great, but I thought it was expensive. Since then, I discovered some of the many uses of vinegar. If your shower head has developed a calcium/lime scale build up, there is no need to run out and buy some expensive cleaner. For this, I used an old margarine tub. Pour enough vinegar into the dish to cover the build up and soak the shower head. I started to see results after just a few minutes, but for good measure I soaked mine for about two hours. I then used an old brush to get in the crevices and now I have a clean shower head!
Here are some other popular uses for vinegar: