Best cleaning solution

[WashRite 14]

I am quoting this commercial property for gum & stain removal as well as surface cleaning the concrete and cleaning the walls up to and including underneath the overhang.

However, I have also been asked about the stains running down from the sign. See attachments. What is the best method and recipe to clean this with? The substrate appears to be a form of stucco and is off white. I have to respond by Wednesday. Any help would be appreciated.

[Doug Dahlke 114]

Looks like the stains could be rust. Call Prosoco or Eacho Chem for some help.

[814jeffw 71]

I would suggest oxalic, as Doug said it looks like rust.

Jeff

[WashRite 14]

didn't know if oxalic would brighten the substrate too much being that it is off white. Also, didn't know if there were other alternatives than oxalic.

[squirtgun 122]

The only way to keep the color even is by using the oxalic on the entire area.

[One Tough Pressure 580]

Look into Eacochem Saferestore. | EaCo Chem Inc. | Sabre |

http://eacochem.com/pdf/literature/windowsandwalls.pdf