I'm unsure of when to use 20% hydrogen peroxide versus a 2-part oxidizer like stain magic or prochem's stain rescue? In which situations would you use 20% h2o2, and in which situations would you use stain rescue??
The two part has the hp, then ammonia for a ph boost and some surfactancy. That's what I've thought anyways. I'd probably use hp on pre-spray for the yellow, crap and coffee stains. Then if it doesn't come out use the 2 part.