Hopefully someone can ID this, lots of rust on the concrete, but this cheetah pattern is impossible! 3500psi,
Oxalic acid and straight F9 won’t touch it.
Maybe a dumb question, but you tried SH right?
No, I haven’t yet. It doesn’t seem to be organic, but I would assume 3500psi would have at least gotten some of it off if it were.
This was my test spot for the customer, about 100’ away, so they are expecting it all to look like this. And so was I.
So how did you get the test spot clean?
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F9 Barc. Made it look 90% new. But this is completely different, it was much darker before the F9, but it didn’t even brighten up the concrete. It’s almost like it’s sealed or something. There’s about 10 sections that are like this, with that cheetah pattern on it. I’m completely lost on this one.
Im no expert on any concrete or house washing .but your a truck driver @ShinedUP ,you must have some good aluminum brightner on hand for a lil test spot.
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@Hotshot, unfortunately no I don’t. But I believe F9 has the same acid in it. At least it smells the same🤣.
First thing you do is try the PH range. You tried acid, can’t believe you didn’t throw some bleach on some just to see what would happen. Maybe nothing but then you know for sure what direction to pursue.
I’d email or messenger Craig those pics. Of course looks like all the surface gone anyway and it’s mainly the gravel showing. Definitely interested in what he thinks it is.
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I think f9 barc is phosphoric acid. A hot aluminum brightner is hydrofluoric acid ,like muratic acid. Big difference
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I don’t have any SH, 
. Crazy I know, but I’ve been doing nothing but concrete every day for over a month, I guess I’ll get some tomorrow and try it. Your correct on the aggregate showing, they have used well water for irrigation for over 10 yrs, and it’s been pressure washed several times a year by god knows who. I was 100% sure OX or F9 would make it happen. The POA president didn’t want me to test in that area because it was going to be a few weeks before I got to complete it and it’s right at the entrance. So I hit it on down the road and she was really impressed. I priced it way high, and ordered 8 gallons of F9. Forgive me but who is Craig?
Craig Harrison - he’s the F9 guy. Can find him on FB. He’s quick to get back to you.
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@Hotshot
Regularly. Mike is a great guy and has helped me out MANY times. They push Landa really hard, but I’m not a millionaire
I just got off the telly with Cody the machine pimp and Colt the mechanic . Sounds like good people. I’m meeting them Monday for a sit down. About 2 hrs from me. I’d love to have a 1 stop shop for Chemicals and machines. Thanks @ShinedUP
F9 Efflo 10:1 first.
Scrub
Surface clean
Let dry
Barc straight and heavy
Let dry
Mist area with water
Let dry
Another light coat of Barc straight
Let dry
Mist area with water
Run broom over area to even out chemical
Let dry
Rinse off area with low pressure
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@Hotshot thank you. Yeah it was pretty cool. It was at a school. Unfortunately did not do the job yet. We are a couple months past doing that test spot and it is a light orange color. Rest of the concrete is much darker than in the picture. The well for there irrigation has an insane amount of iron in it. They are getting another one drilled deeper and I will get that project next spring.
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I deal with the TC Chem guys in Mississippi all the time. Great guys down here as well. I hear they just opened a new store in AR and hear it’s really nice.
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