Copper stains on precast

[sweetwater]

Looking at cleaning a munincipal building with a precast band that has severe staining from the copper gutters leeching onto the concrete. Wanted to get the forums ideas on the best way to remove or lighten the stains.

 

[starbrite]

They most likly wont come completely clean. I have had a tremendous amout of success using One Restore by EcoChem. I've teaken a lot of stains out of precast with it. It works on everything else too. If it wasn't so expensive (about 100 5 gal) I'd use it everyday. Apply it with a pump sprayer, you can't dilute it.

 

[sweetwater]

Staining goes all the way around building... Guessing they have copper flashing above concrete. How about oxalic? Anyone have success with that vs. Copper stains???

 

[sweetwater]

another photo

here is another angles and you can see the "green" from the copper a little more clearly

 

[Doug Rucker]

They most likly wont come completely clean. I have had a tremendous amout of success using One Restore by EcoChem. I've teaken a lot of stains out of precast with it. It works on everything else too. If it wasn't so expensive (about 100 5 gal) I'd use it everyday. Apply it with a pump sprayer, you can't dilute it.

I have found that diluting One Store and giving it time to dwell works as well as using full strength. But you gotta price for the time.

 

[pdmcali]

Are you sure that all Copper Stain? Here is a building we did in March and this was from rain run off from the roof. We used regular house wash to remove this.

 

[starbrite]

How much dilution and dwell are you talking about Doug?

 

[Markgkda]

I have a similar situation with copper above brick. Will be cleaning it this Wed with One restore. Ill let ya know how it works on that. I have confidence in One Restore to do the job.

 

[Doug Rucker]

How much dilution and dwell are you talking about Doug?

I always start with it 50/50 and add more One Restore as needed. It all depends on the surface/stain for the time. BUt it is usually just a few more minutes versus full strength.

 

[apple]

One restore is good stuff. We used it to clean copper stains from sidewalks the other day.

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