Here's a freebie that's completely practical. Stain Brain identifies over 85 common stains and tells you what to do about them. The step-by-step removal procedures come to you courtesy of the experts at Tide. And they ought to know. The app lets you rate the effectiveness of the solutions and even lets you share your own tips for removing difficult stains. You can browse the top-20 stains, find stains by category, ask questions, communicate with other community members, and, naturally, navigate to product pages to find additional information and store locations.