I have a balcony where I left an old shovel outside too long after the
winter. The 'floor' of the balcony is made of concrete. There is now a
stain from the rust of the shovel on the concrete. I noticed that even
through a relatively rainy spring, the stain is still there. Is there a way
to remove this rust stain?
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1. Mix 1 ounce of tri-sodium phosphate (TSP) in a gallon of hot
water. This chemical can be found at hardware and paint stores. Wet the
concrete and use a scrub brush to apply the solution. Scrub vigorously and
let the solution soak into the concrete for 10 to 15 minutes. Rinse well.
2. Try a product called Iron Out, which is sold in plumbing supply
3. Combat really bad stains with a pressure washer and muriatic
acid. Apply the acid as directed by the manufacturer, leave it to soak for a
few seconds, and follow with a pressure washer set at 2,500-3,000 psi.
Sprinkle baking soda over the cleaned area to neutralize the acid and wash
Start with CLR (grocery store item). If that doesn't do it you can use
a diluted solution of muratic acid (pool store item). Don't leave the
muratic acid on too long (just long enough for the stain to vanish) and
wash VERY throughly.
If you can find it, you can mix up a solution of oxalic acid and water and
apply it to the stain. Hard scrubbing is required.
For definitive answers to concrete problems, look at this site:
Best of luck,
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