When I was on the road selling truck mounts and giving out samples of
Prochem's first powered emulsifier, "Dry Slurry", in my early 20s, old guys would put their hand on my shoulder and say:
"Son, when you get a product that will take Koolaid out of carpet, you'll be a rich man!"
All sorts of Koolaid removers showed up by the mid 80s, but cleaners just figured out how to give away taking that troublesome stain out instead of "getting rich on it"
45 years later, I'm not rich either , but at least the Koolaid is pretty much gone....