How To Spot Clean Old or Set-In Upholstery Stains

By this point I'm reasonably certain that the majority of responsible furniture owners are aware that spills and stains on upholstery should be cleaned immediately, with all due haste. It's the right thing to do, and stands the best chance of successful stain removal. But, let's consider for a moment the times when it's just not possible to immediately handle a stain.