Orange stains on Valley concrete almost always come from one of three places: sprinkler overspray carrying iron out of the water, fertilizer tracked across the slab and watered in, or metal furniture and rebar bleeding down. None of it comes off with pressure, no matter how much you use, because the stain is a chemical reaction inside the surface. It takes the right acid treatment, correctly neutralized.
Call (602) 497-2474Get a Free Quote
This is the single most common thing people try to pressure wash off and cannot. They run a machine over an orange stain for twenty minutes, get nowhere, and conclude the concrete is ruined. It is not, but pressure was never going to work, because the stain is not sitting on the surface. Iron has reacted chemically inside the pores of the concrete.
Reversing that takes an oxalic acid treatment, which unwinds the reaction and lifts the discoloration out. The alternative some contractors reach for is grinding, which removes the stain by removing the top layer of your concrete, and leaves a visibly different patch where they worked. We would rather treat it.
In the Valley the source is almost always one of three things. Sprinkler overspray carrying iron out of groundwater is the most common, and it leaves a distinctive fan-shaped stain. Fertilizer granules tracked onto concrete and then watered in is second. Metal furniture feet, a leaking battery, or rebar bleeding through thin concrete is third. We identify which one you have, because if the sprinkler head is not redirected the stain simply returns.
Valley groundwater carries enough iron that sprinkler overspray leaves a fan-shaped orange stain wherever it hits concrete or block. It is the most common rust we treat, and it will come back if the head is not redirected, so we tell you which one is doing it.
Rust is a reaction that has happened inside the surface, so pressure will not lift it. An oxalic acid treatment reverses the reaction chemically, which removes the stain without taking off the top layer of your concrete the way grinding does.
Fertilizer granules watered into a slab, a leaking battery in the garage, metal furniture feet, and rebar bleeding through thin concrete all stain differently. Each gets a different dwell time and concentration.
Every treated area is neutralized and thoroughly flushed before we leave, with landscaping pre-wet and rinsed down. Leaving acid active on a surface is how you end up with etching, so this step is not optional.
Most of the time, yes. Sprinkler and fertilizer staining generally responds very well to oxalic treatment. Very old, deeply saturated staining may lighten dramatically rather than vanish entirely. We look at it and tell you which outcome to expect before quoting.
Because the source is still there. Iron-bearing sprinkler overspray will re-stain the same spot every cycle. Part of what we do is identify which head or fixture is causing it and tell you, so you can redirect it. Treatment without fixing the source is a temporary result.
It is priced by the affected area and severity rather than by the whole slab, with most residential jobs falling between $150 and $400. It is commonly bundled with driveway or patio cleaning, since the surrounding surface usually wants washing anyway.
Yes, when it is done properly, and the neutralization step is what makes it so. Every treated area is neutralized and thoroughly flushed before we leave, and landscaping is pre-wet and rinsed down. Acid left active on a surface is how etching happens, so that step is not optional.
Yes, all three, with concentration and dwell time adjusted per material. Pavers and stucco are more sensitive than poured concrete, so they get a gentler approach and sometimes more than one pass rather than one aggressive application.
Loading interactive site…