Blood dries to a dirt like brownish burgundy in most instances

Working for used car lots as a painter, you wouldn’t believe the stuff I’ve seen. The worst is when people put stuff in the seats like needles or nails. When someone knows their vehicle is going to get repossessed, they can do wild stuff in frustration.

The actual key to really cleaning automotive interiors is to use a wet/dry vacuum that is setup for wet. All the crap that you spray is just burying the gunk. Just use shampoo, scrub, then suck all of the moisture out with the vacuum. Worst case scenario, seats and interior panels are not very hard to remove. Take out the carpet and pressure wash it. Like 99% of your car’s smell is from the carpet. If you can get a reproduction replacement carpet, it will make the car feel and smell like new in a way unlike any other change. Seriously, if you have an older model and can get reproduction carpet and headlights from LKQ or similar, you’ll completely change your perspective on the vehicle’s age.