Q. How do I treat an organic and inorganic stain?

A. The chemical of choice for both Organic and Inorganic stains is Hydrogen Peroxide (30/40 volumes, the clear type – available at your local beauty salon. The one from the drugstore is too weak, at 3.5 volumes). Sometime, in the case of ink, Denatured Alcohol (or rubbing alcohol) may turn out to be more effective.