I have granite and was told nothing could damage it apart from lemon juice! So we treat lemons like kryptonite here! This is quite interesting altho doesnt mention granite:-
Vinegar Cleaning uses
White vinegar is often used as a natural household cleaning agent. With most such purposes dilution with water is recommended for safety, reduced risk of damaging certain surfaces, and budgetary reasons. It is especially useful for cleaning mineral deposits on glass, inside a coffee maker, or other smooth surfaces. Vinegar is an excellent solvent for cleaning epoxy resin and epoxy hardener. It will even clean epoxy that is starting to harden. Care should be taken not to allow contact with the eyes (if such contact occurs, the eyes should be flushed immediately and persistently with warm water) or skin (the affected skin area should be washed thoroughly after use). See household chemicals.
Vinegar is also very good to clean off chewing gum stains from clothes; usually normal cleaning products are not capable to clean off chewing gum, so rubbing with vinegar before the machine wash should do the trick.
Diluted apple cider vinegar can be used to deep clean dreadlocks, removing residue and even beeswax. One method involves spraying a mixture of one part vinegar to four parts water onto the hair, letting it soak in, rinsing with water, and repeating this process as many times as necessary.
A few tablespoons of white vinegar mixed with a few teaspoons of common table salt makes an excellent cleanser for cleaning badly-stained stainless cookware. This vinegar and salt mixture can also remove oxidation from copper-clad cookware and make it shine with practically no rubbing required.
One cup of white vinegar to four cups of water (for a stronger solution, one cup of white vinegar to one cup of water works) makes a fine window-washing fluid, substituting for Windex. If windows appear streaky after washing with vinegar, add a half-teaspoon of liquid soap to the mix. This removes the waxy, streak-causing residue left over by commercial window cleaners.
Drains can be cleaned by using a combination of vinegar and baking soda. Pour one-half cup baking soda down the drain, followed by half a cup of white vinegar. Let sit for a while. Cover the drain while it works, then pour a tea kettle full of boiling water down the drain. This is a good way to prevent build-up in the drain.
Vinegar also works well as a fabric softener; just add half a cup to the rinse cycle.
Add a cup of vinegar to an empty dishwasher and run through the washing cycle to remove mineral deposits and odors. You can also put it in the rinse dispenser instead of Jet Blue.
Removing odors using commercial cleaners often causes damage to surfaces. Vinegar can act as a very effective odor-remover especially in situations involving sensitive surfaces.