What is the best channel to remove coffee stains from concrete? I have spilled coffee on my concrete yard floor several times now....

I have spilled coffee on my concrete yard floor several times now. These stains are aged so they are strongly set in. I detestation seeing them and can't wait for some recommend!
Cats from scratch?
Answers:    Try some bleach and some dishwashing detergent. Scrub a bit let it sit and rinse it sour. If it lessens any try it again.

Good Luck!

Edit: oooooor I don't know how feasible this is but if you have a neighbor next to a pressure washer that will get it out surrounded by an instant! But you'll have to do your full patio or it will be too verbs in that one spot! lol

You possibly able to rent one too if no neighbors own it.
Do u ever look around?
Try oxyclean. That stuff works miracles.