[header] How to remove ink stains from cement [title] Combine 2 tablespoons of sodium perborate and 1 cup of very hot water in a large bowl to make a sodium perborate hot bleach solution. [title] Add whiting to the solution until the mixture forms into a thick paste. [step] Whiting can be bought in some paint stores. 
If whiting is not available, you can use kitchen flour. [title] Thoroughly wet the surface to be treated with clean, clear water.