Need some help

I think this is carbon build up from the road with some mold on it. We have tried Bleach, HCL will eat it off but leaves it kinda orange, and 4 different products from Prosoco. The sales rep from Prosoco said to try their concrete cleaner but we haven't done it yet.

They are 3 stories tall and there are 174 limestone blocks under the windows.

Ash I'll call you tomorrow what is a good time to much for me to say easier if I call

Clean it. If its orange it must have been in the concrete mix? Are you sure its not the original color, the same color will look better than what they ARE NOW. That might not be the answer your looking for but it's an answer.

Mike Cooke said:

Ash I'll call you tomorrow what is a good time to much for me to say easier if I call

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After lunch 205-369-8133

Thanks

Ash I have some Pro BRC (Building Restoration Cleaner) Masonry Cleaner from Sunbrite, you can have. I have no idea if it will work for what you need, but I have 30 gallons or so you can have if you want it. Oh not sure if it goes bad, but its been sitting there for a couple years. Anyway, let me know if you want it.

Sentinel said:

Ash I have some Pro BRC (Building Restoration Cleaner) Masonry Cleaner from Sunbrite, you can have. I have no idea if it will work for what you need, but I have 30 gallons or so you can have if you want it. Oh not sure if it goes bad, but its been sitting there for a couple years. Anyway, let me know if you want it.

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Doesn't go bad as long as it doesn't freeze.

It looks like water is penetrating into the stone and leaving behind carbon deposits and dirt. Bleach and some other products will turn limestone orange. Pick up some of Prosoco''s Limestone Restorer. Wet down the stone really good, apply the Limestone Restorer, let it dwell for a bit and use hot water on it. The stains will usually come out but it may take a couple applications or so.

Keep your pressure under 1,000 PSI and make even sweeps when you clean it. Pretend it's wood when your cleaning it to keep a consistant finish.

They also have a limestone 2 step system you can use, the first step is a paste, the second step is an acid nutrilzer wash. I don't use that one very often though and I doubt you will need it to clean this stuff, it doesn't look like it has too much buildup to remove.

Here are some photos of a limestone area I did using the method I just listed.

Nice work Henry, can't argue with those results.