A colourless solvent made of a mixture of mineral salts. Among its many uses, it is a paint thinner and general-purpose grease remover. White spirit can sometimes be used instead of turpentine and is much cheaper. Flammable and toxic, it dries out the skin's natural oils and may cause an allergy.
Alternative
Use white vinegar or lemon juice instead of solvents to remove grease stains. There is no alternative for thinning paint. Unless you paint is water based and then you can use water.