Depending on how long the concrete has been sitting without having been cleaned, and the origin of the stains, due to the porous nature of the stains, sometimes it is impossible to totally clean concrete.
I have had some luck with regular bleach on outdoor concrete squares.
Every time I clean my mirrors, they end up having tons of streaks and almost look worse than before I started. What could I use to clean them that won't leave streaks...
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Use a pressure washer for best results.
Where is the concrete- basement, patio, etc.??
Depending on how long the concrete has been sitting without having been cleaned, and the origin of the stains, due to the porous nature of the stains, sometimes it is impossible to totally clean concrete.
I have had some luck with regular bleach on outdoor concrete squares.
To powerwash it. That is the best way
concrete outside.....Wet and Forget
I agree that power washing is best but keep in mind if there are heavy stains you will never wash it back to new.
http://home.howstuffworks.com/home-improvement/household-hints-tips/cleaning-organizing/how-to-use-muriatic-acid-to-clean-your-driveway.htm