Hi Les. I'm Cindy / Justice? Mix a half-cup of baking soda into a gallon of water. Add one-eighth cup liquid dish soap. Spray this solution on your concrete and let it sit for 30 mins. Then scrub and rinse. For heavily stained or mildewed jobs, you may need to use a pressure washer. Good luck Les.
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https://www.hometalk.com/diy/clean/outdoor/how-to-clean-concrete-43336329
https://www.hometalk.com/diy/clean/outdoor/make-concrete-stains-go-away-14582761
How To Clean Concrete
Make Concrete Stains Go Away
Hi Les. I'm Cindy / Justice? Mix a half-cup of baking soda into a gallon of water. Add one-eighth cup liquid dish soap. Spray this solution on your concrete and let it sit for 30 mins. Then scrub and rinse. For heavily stained or mildewed jobs, you may need to use a pressure washer. Good luck Les.
Pressure washer using Krud Kutter from Lowes works great for us.