About 1800 psi, low heat, like 115-120, but don’t have to have.
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Hydroxide, hit it with a brush, washed off with low pressure…didn’t touch them at all 
I don’t use heat or fancy chemicals at all, but that looks like tractor tire marks. Usually tire marks from that kind of equipment are comprised of softer rubber & much easier to wash away than car tires with a little persuasion. I have a ball valve in front of my surface cleaner & when the situation is sensitive, I’ll close the ball valve completely, pull the trigger on the SC & slowly open the ball valve until I find just the right flow / pressure for whatever I’m working on. Scaling the pressure UP instead of down on the surface cleaner by manipulating flow to find the sweet spot. ZZ Top in the ear holes seems to help.
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That’s what I told them to do…but they swore they were seeing cream coat washing off, so I told them to pack it up. If I still had a 5.5gpm mounted up anywhere, I’d have sent that with an SC set up for 8gpm … our heat is still mounted on a folded up crap Powerline trailer, which I’m debating if I have the inclination to even reconstruct/relocate to a newer platform. May just get bigger QCs and throw it in the service pickup with a small buffer if we ever need it…
So tell the customer what services you’re going to provide as opposed to what outcome to expect & you wouldn’t be in this pickle. Over deliver & go take a ride on your boat you slacker. Get out of the cubicle!
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I’d have walked on this customer from the start, but it was a relationship thing…it was a contractor that we partner with, that had one of their suppliers do this with their piggyback material forklift. They needed me to try and fix it…we couldn’t. Wasn’t about to risk creating new problems that could fall into my lap to make it happen.
golden eagle would be my first choice. after that it’s custom brew.
