Most stains are removed by dissolving them with a solvent. The solvent to use depends from two factors: the agent that is causing the stain, and the material that has been stained. Different solvents will dissolve different stains, and the application of some solvents is limited by the fact that they not only dissolve the stain, but also dissolve the material that is stained as well.
Another factor in stain removal is the fact that stains can sometimes comprise two separate staining agents, which require separate forms of removal. A machine oil stain could also contain traces of metal, for example.
Also of concern is the colour of the material that is stained. Some stain removal agents will not only dissolve the stain, but will dissolve the dye that is used to colour the material.
Read more about this topic: Stain Removal
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