Kill your friend, then drain his blood and separate the plasma from his blood and use your dead friend's blood plasma and
Resolve Carpet Cleaner.
Spray the area with the spray, then use a wet WHITE CLOTH (no dye in the cloth) to scrub the area. Then use another towel to soak up the stain and dry it up. Then lower the windows in the car and let the sun dry it up the rest of the way. Make sure you put the windows up before dew settles.
My wife says this is how it's done. Therefore, this IS how it's done. She's good like that.