Name the stain type
Stains fall into families, and each needs a different kind of product. Texas A&M AgriLife Extension splits them into "dry" stains that don't dissolve in water (oil, butter, wax), "wet" stains that come out with water (soft drinks, tea), and combinations of the two. Wet stains are further split into tannin, protein and dye. [13]
Enzymes in bio products target protein, starch and fat. [2] Oxygen bleach lifts drinks and fruit stains. [6]