Both Woodrich Brand HD-80 and EFC-38 are excellent cleansers for concrete and other hard surfaces. Of course, you should take the same care as you would when using them for wood restoration. Rust and other mineral stains may be removed from concrete with Woodrich Brand Citralic Brightener and Neutralizer. You may moisten the area and then crush in some dry Citralic powder to make a thin paste for severe concrete stains. Allow the paste to dry completely on the surface before rinsing it away. As needed, repeat.