Rust stain on concrete

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?

Clint

Reply to
Clint
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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 stores.
  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 again.
Reply to
Captain Ron

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.

Reply to
Travis Jordan

Yep. Right here.

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Reply to
BigNick

CLR, sold in a gray plastic bottle. Possibly ZUD, a cleanser that contains oxalic acid. Bar Keeper's Friend and Naval Jelly are other products. Use a wire brush and follow the product directions.

Reply to
Phisherman

Okay thanks very much for the tips guys -- I will try it out and see what happens. I won't leave the shovel out there anymore - better yet, I'll get a shovel that doesn't rust.

Clint

Reply to
Clint

Reply to
nospambob

Hi,

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:

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Best of luck,

David

Reply to
David Alexander

Reply to
nospambob

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