Get(ting) Serious! about ig poo stains
She recommended Get Serious, which is available at the big box pet stores as well as from some online stores. It is a fragrance-free enzyme mixture that lifts the biological remnants from the carpet and other surfaces.
Squirt the GS on in a zig-zag pattern - don't soak the area. Rub the brush side-to-side, side-to-side, then up-and-down, up-and-down, repeating the sideways and up-and-down for 15 seconds, then blot with the towel til nothing more comes up. That's it.
I have been using it, and it really does work well. It works best on new deposits, but also on older stuff. And it's easy to use. You just need the squirt bottle of Get Serious (they make versions for dog and cat, but they really are the same and can be used interchangeably), a scrub brush, and a terry cloth towel or, if its a small area, one or two Viva Paper Towels (my preference, for their thickness and capacity to soak up stuff without ripping and shredding).
It also removes dried blood, as I found when I cleaned up the blood that dried on the carpet several weeks after my last iguana bite.
Got stains? Get Serious!