Often an ink-eradicator such as is sold to remove writing from paper will take ink spots out of white material.
Paint.—Turpentine will remove paint from fabrics, also from glass or iron.
Mildew and grass stains.—Try lemon, salt and sun applied as for iron rust.
Try diluted oxalic acid.
If the material stained is white, try boiling it in buttermilk.
Try alcohol for grass stains.
Or rub them with molasses and then thoroughly wash the fabric.
Grease spots.—If the article may be washed, try washing it with cold water and white soap.
Or, moisten it with a strong solution of household ammonia and water, cover with blotting paper and iron dry.