Removal of copper sulfate stains from concrete?

[SHOZ]

H2O2 good idea.

Not wanting to pour antifreeze on the concrete. Thanks.

Borax is the key. Antifreeze is the carrier I use it when treating wood. Antifreeze will evaporate anyway.....

 

[Pablo]

I went acid/oxidizer. Seemed to do the job, drying now.

Citric acid crystals broomed in with force, sit overnight. Pour 15% H2O2 on the citric, instant green solution, soak and broom. Rinse.