If homemade recipes are not tough enough to remove the hard water deposits in your home, a trip to the local hardware store might help. Products such as CLR, Lime Away and Zep Calcium, Lime and Rust Remover are formulated to remove tough mineral stains. Always follow manufacturer directions when using these products. Be sure to open a window and/or turn on a fan to ventilate the area well; wear gloves. Also, always be sure the product is compatible with the surface you plan to use it on.
A visit to an online forum about the topic revealed many products which people claimed removed their hard water deposits. Some of the most common suggestions (other than lemon and vinegar) include: CLR, The Simple Cleaning Solution, Orange Hand Cleaner with pumice and Bounce dryer sheets.