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How to remove ink stains from cement
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.
Add whiting to the solution until the mixture forms into a thick paste.
Whiting can be bought in some paint stores.
If whiting is not available, you can use kitchen flour. Thoroughly wet the surface to be treated with clean, clear water.