Our beautiful white quartz kitchen countertop had a rust stain from a steel jug. Neither vinegar nor bleach nor a citric acid solution will spoil it. However, two teaspoons of oxalic acid dissolved in half a cup of warm water, applied with a sponge and left for 30 minutes was enough. The stain has completely disappeared. I use the remaining 1.99 pounds of oxalic acid dissolved in water to lighten the bare topwood in the spring.
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