Not all stains come out in the machine. That statement may be contrary to what you've been told by product advertisements (i.e. Tide, OxiClean, etc.), equipment salesmen, or what you've convinced yourself to be true. Stains fall into four distinct categories: solvent-soluble (dry cleaning), chemical-soluble (using additives), water-soluble (steam spotting, wetcleaning, laundry), and insoluble (lubrication [...]
