and get some Nature‘s Miracle spray. It has enzymes that makes stains dissapear. Really amazing!

what I'm talking about here. Already been treated with enzymes so it doesn't smell. Odorless old shadows of previous accidents (old dogs) that aren't going to react to enzymes anymore, because they've already been treated that way at least three times with my Bissel "steam" carpet cleaner and rug doctor products for pets. These really are just the thin ghosts of things that happened a long time ago and haven't been smelly for a few years, but there's still a light stain that this treatment helps with considerably after all of the other stuff, still left an odorless stain you can see on the carpet. This works.

for stains and it has worked for anything biological. No chipping. But if it doesn't work, I will try adding baking soda.

I even had a neighbor who had a horrible nose bleed and had a huge blood stain on her carpet. She had tried washing it out and it didn't work. We poured hydrogen peroxide on it, let it bubble, toweled it up, and repeated. It cleaned everything up. In fact, for blood stains, this is all I ever use.