The active ingredient in Revive is Oxalic acid dihydrate. The forum's resident chemist (Nestor) is no longer around to explain if it would eat the zinc galvanizing. Maybe there is another chemist out there ???
But my guess is that its not "dirty", its been chemically effected. If worst comes to worst, you can put a line of painters tape on the ceiling, maybe 15" from the wall and paint the discolered area. You will get different opinions on whether to try to match the color or contrast it. But note that paint does not stick to galvanized steel very well, so use an appropriate primer.
Thank you for the information.
Update: The company came back out and tried a cookware cleaner from Royal Prestige when they came back out to resume work and it seemed to clean it up to some degree. Certainly didn't look new, or like they put much effort into the cleaning, but i am certainly happy it moved the needle in the right direction.
Got a BIGGER problem on my hands now... So, when this came up, the wife and i also talked about how we have never really cleaned any of the panels on the home and that it would be nice when the staining of the home is complete, for us to try to clean the panels. They have always had some small, scattered, white stains on them that we were hoping to get cleaned off.
So i think back to the suggestion of White vinegar. In fact, i had even tied using it at the very bottom of the staining the workers caused to see if that would be a viable option to clean up THAT issue. It didn'd alter those markings but i had also read online that it really does work on the hard water stains. I go out to the side of the house, a more inconspicuous area and give it a test. It works! The little white spot looks gone! So, i proceed to wipe down the length of the panel where the other white areas are built up....annnnnnd... within 10 second i could see a HUGE difference. Not only did it remove the white marks, but i COMPLETELY changed the finish on the panel. So frustrating... So i go back, look online and of course it should be diluted. So here is what i am dealing with now (PHOTO ATTACHED)
Obviously i feel like an idiot... I have no idea what to do now. I have rinsed it off, no change. Its on the side of the house, and there are probably 15 panels that are on that side of the home. First thought was to use a diluted water /vinegar solution, try to clean the entire side of the home, so it would blend in... but at this point i am scared to touch it and make it any worse.
Thank you all for the input.