HD-80 and EFC-38 are both very effective cleaners for concrete and hard surfaces.
Of course you want to follow all of the same safety precautions as when they are used for wood restoration.
Citralic Brightener/Neutralizer will effectively remove rust and other mineral stains from concrete.
For severe concrete stains, you can wet the area and then grind in some of the dry Citralic powder making a thin paste.  Allow that paste to dry on the surface and then rinse away.  Repeat as necessary.