"and the lady there gave me a bottle of some sort of cleaner bleach detergent whatchamacallit and showed me to squirt the blood with it then put it in the machine and let it soak for 10 minutes before starting in the machine and It was completely gone..."
You don't need anything fancy; just any top shelf spot remover like Shout or Zout, or liquid detergent such as Tide, Persil, etc...
Apply bit of stain remover to blood mark and work into stain as directed. Wait given recommended time, then apply hydrogen peroxide that comes in brown bottles from chemists. Wait a bit again, then launder as usual. Works every time!
Keep a bottle of Ecolab "protein" spot remover or Spray and Wash stain stick near hamper. When something has blood stain hit it with a bit of either, then bung it into hamper. On wash day things go into machine and blood is gone.
What laundry attendant likely offered was a packaged spot remover that contains hydrogen peroxide and solvents. It couldn't have enzymes as the peroxide will kill them off making product not shelf stable. There are "dual action" products that have enzymes and hydrogen peroxide, but these are in two separate containers joined as one bottle. When you squeeze or pour things out the two mix....
How people choose to deal with blood marks normally comes down to how much of it there is on wash day. Spot treatment works well for one or maybe a few items, but if you've got an entire load (such as healthcare, mortician, cleaning up after a horrible accident, etc...), in wash treatment is way to go.