WHICH HOUSEHOLD PRODUCT CAN BE USED AS RUST REMOVER AND WHY?

In our daily life we use lot of metal objects. But we also know that that rusting is the enemy of metal. Rust eat the metal and make them weak. So how we can save our metal objects if rusting is started. 

Some of the definition of rust.
1. Any of various powdery or scaly reddish-brown or reddish-yellow hydrated ferric oxides formed on iron and iron-containing materials by low-temperature oxidation in the presence of water.
2. Any of various metallic coatings, especially oxides, formed by corrosion.
3. A stain or coating resembling iron rust.
4. Deterioration, as of ability, resulting from inactivity or neglect.

ANSWER :-

Vinegar can be used as rust remover and vinegar is used in almost every home. Weak acids can dissolve and loosen the crumbly hydrated iron oxide (which is what rust is) to form a soluble salt they can also replace it with a thin film of smooth hard oxide on the surface of the iron to help it resist further hydrated oxidation.  Phosphoric acid (coca cola) , and citric acid (lemon juice) are other acidic rust removers.

Reaction 

Vinegar contains acetic acid CH3COOH which reacts with rust FeOOH:

3CH3COOH + FeOOH --> Fe(CH3COO)3 + 2H2O

and iron (III) acetate Fe(CH3COO)3 is water soluble.