Mix 1 cup of bleach with 2 gallons of water in a bucket to remove stubborn leaf marks. Apply the mixture to the concrete and let it sit without drying for five minutes. Scrub the stain vigorously with the brush and rinse off the bleach mixture with a power washer.
It cleans off all stains
We power washed ours it worked nicely
Pressure wash with a mild detergent. If you don't have a pressure washer, you can purchase a wand that will hook to your garden hose. It increases the pressure intensely and then you can wash away quite a bit of staining.
Rent a power washer....
We use a pressure washer a lot here. It is great for getting stains from leaves and moss off the sidewalk.
Did you use any soap?
Caroline....A pressure washer and Krud Kutter works (Lowe's).
Power washing your patio should remove the stains.