Besides power washer what can be used to clean black from concrete
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Try Wet and Forget
An electric sander.
scrub brush w/ long handle
Here's an article with a bunch of natural ingredients to try:
http://homeguides.sfgate.com/natural-homemade-cleaners-concrete-patios-79379.html
Here's another article that might interest you since black spots might be mold:
https://www.concretenetwork.com/fix-concrete-cleaning/clean-mold-on-concrete.html
What is it from? If it's tarry, I would use a petroleum based cleaner to remove it. I've also found wonderful success on tough marks with Goof-off.
Vinegar, dawn dish soap, a stiff bristle long handled push broom and a hose!
Use some SuperClean, It's usually called the purple stuff. You can purchase at any auto parts store or Walmart has it to. Just spray it on let it sit for a few minutes then rinse it off.
Bleach. Don't put bleach into the power washer, but, rather, pour or spray onto the concrete. Let sit a few minutes, then use a power washer (or sprayer) Wear protective glasses and a mask. We did this and it worked great.
MOVED TO FLORIDA seems all sidewalks\driveways like that tried bleach with purple stuff does a lil whitening not much