Lemon juice -not like a stain this time.Lemon juice and its natural structure has the power to absorb different types of steady stains.Oily stains cannot resist on it.It will not remove the whole stain but will help you cleaning it.You can use a fresh lemon juice and pour it over the stain.Leave it from some minutes untill it began to react with the stain's surface.After that swab up with dry cloth.Use a dergent or other mothod to finish the cleaning.In other cases yu can use direclty the whole lemon.You can rub the stain with the fruit.The interaction between the structures if the lemon and the stain will be faster and the result will be better.The lemon is a good "weapon" against the paint stains,oily spots,and chocolate one.