Good thread, I bought a gallon of PigOut about a 6 months ago.
The only thing I know about it is what I learned in upholstery class,
If you dont know what kind of stain it is you use a volatile solvent first.
I used pigout a couple of times but I can not stand the smell. It really lingers
and I also dont like that its very flammable.
The most confusing thing to me about carpet cleaning is the correct use of the spotters.
For example, Cyclone, Hel-Gel orange and PIG out are all essentially used for the same type of stains
They are all POG/PIG removers it's just that Cyclone is the healthier choice and safer choice, followed by hel-gel then PIG out.