What is the best channel to remove coffee stains from concrete?
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.
Try oxyclean. That stuff works miracles.
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