Dilute acid, handled carefully, takes off the mineral scale, efflorescence and rust bloom that soap and pressure leave behind. Neutralized, rinsed and pH checked before we pack up.
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Or Call Us NowQuick answer. Acid washing uses a dilute acid solution to dissolve mineral deposits that water and detergent cannot touch: hard water scale, efflorescence, rust bloom and lime staining on concrete, pavers, brick and pool tile. The surface is soaked with water first, the acid is worked in short sections, then the whole area is neutralized and flushed. Free estimate from Valley Wash Pros, call (559) 975-8124.
There are two different problems people call dirty concrete. One is organic, algae, mildew and leaf tannin, and a normal wash handles it. The other is mineral, and no amount of pressure moves it, because the deposit is chemically bonded to the surface. That second one is the job acid does.
The order matters more than the acid does. We clean the surface first, because acid spent on loose dirt is acid that never reaches the deposit. Then we flood the slab with plain water until it stops drinking. That is the step most people skip. Dry concrete pulls acid deep into the cement paste and you get a bleached, sandy patch that looks worse than the stain did. A saturated slab keeps the acid working on top, where the scale actually is.
We work in sections small enough to rinse before anything dries, usually a panel or two at a time, and in Fresno that section gets smaller in July than it does in March. Then everything gets neutralized. That is its own step with an alkaline rinse, and we check the runoff has come back to a neutral pH before it leaves the property. Acid left in concrete keeps reacting after we are gone, and that is how a slab turns chalky two months later.
Pricing runs on the real variables: square footage, whether it is broom finish concrete, pavers, brick or pool tile, how thick the deposit is, how many passes it takes, and how much landscaping and drainage we have to protect. You get one number, in writing, before we start.
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Acid washing is for mineral problems: the white bloom on a block wall, the crusty ring on pool tile, the orange staining running down a driveway from a sprinkler head, and the hard water film that has greyed out your pavers.
Most of these deposits came from water. Fresno tap water is hard, county well water carries iron, and both of them land on your hardscape every time the irrigation runs. The mineral dries in place, the next cycle adds to it, and after a few seasons the surface is wearing a shell that a surface cleaner just polishes.
That is why the fix is chemical. We match the acid and the dilution to the deposit and the substrate, test a small area out of sight first, then work the surface in controlled sections with a neutralizing rinse behind us.
On the commercial side the same work shows up as dumpster pads, loading docks, fuel islands, restaurant patios and HOA block walls. We are open 24 hours a day, so a retail slab can be washed and neutralized before anyone parks on it.
Why mineral staining needs chemistry rather than more pressure.
Because acid is the one product on our truck that can ruin your concrete in ninety seconds, and the whole difference between a clean slab and a wrecked one is in the handling.
Anyone can buy acid at a hardware store. What separates a controlled acid wash is knowing the dilution for the deposit, knowing how long it can sit before it stops working on the scale and starts working on the cement, and knowing which surfaces are off limits entirely. Get it wrong on a driveway and you etch a light patch that never blends back. Get it wrong on pool tile and you take the glaze with the calcium.
We test first, always, in a spot nobody looks at. That tells us the dilution, the dwell and whether the surface reacts at all. On a sixty year old porch with soft brick and lime mortar the answer is often a much weaker mix and two passes rather than one strong hit, because the mortar will give up before the deposit does.
Site control is the rest of it. Plants and lawn get soaked before anything is opened. Aluminum thresholds, garage door tracks, galvanized posts and anodized window frames get covered or kept constantly rinsed, because they react faster than concrete does. We plan where the runoff goes before the first drop lands, and it gets neutralized on the way out rather than after it has reached a storm drain.
We are licensed and insured, family owned, and open 24 hours a day, seven days a week. Every job carries our 100% satisfaction guarantee, and we take 10% off any service with an extra 5% off for seniors, veterans and essential workers. If your surface should not see acid at all, we will say so and quote you the method that is actually right for it.
That is efflorescence, mineral salt carried to the surface from inside the concrete by moisture, and it is not dirt sitting on top of anything.
Here is the mechanism. Water moves through the slab or the block, dissolves calcium hydroxide and other soluble salts on the way, then evaporates at the surface and leaves the mineral behind as a white deposit. It builds up in the same spots because the water follows the same path every time.
Where it shows up tells you what is feeding it. A white band along the bottom two feet of a block wall is almost always drip line or sprinkler spray hitting the block. A wall that blooms along the top usually has no cap or a failed one, so rain gets into the cores. On a slab it generally means moisture from below, which could be a downspout dumping at the edge, a planter draining under the concrete, or an older pour with no vapor retarder under it.
Acid removes what is on the surface today. It does not stop it coming back, and no cleaner does, because the cause is water movement rather than dirt. If we can see the source we will point it out, because otherwise you are paying to clean the same wall every spring.
Two honest notes. Fresh, powdery efflorescence often brushes off dry with a stiff broom, and if that is all you have got, save your money. And a heavy, hardened bloom on a decorative or colored wall is a case where acid can lighten the wall along with the salt, so a gentler efflorescence remover and more patience is the better trade.
Acid is the wrong call on sealed concrete, colored or stamped concrete, polished floors, fresh pours and most calcium based natural stone.
Sealed concrete comes first because it is the most common mistake. Acid cannot get through a sealer to reach the deposit. All it does is haze and blotch the sealer, so now you have a stripping job stacked on top of a cleaning job. Flick water on the surface. If it beads, something is on it and acid is not the answer.
Colored concrete is next. Integrally colored, stamped, and previously acid stained slabs all lose color to acid, and they lose it in exactly the pattern it was applied, so you end up with a lighter map of wherever the product ran. Same with colored mortar and a lot of manufactured stone veneer.
Fresh concrete needs time. A pour under about a month old is still gaining strength at the surface and acid will burn it. Wait, then clean it.
Natural stone is a chemistry problem, not a technique problem. Limestone, travertine and marble are calcium based, which means acid eats the stone itself and leaves a dull etched patch. Some flagstone and slate tolerate a weak mix, some do not, so those always get a test area first.
Metal is the quiet one. Aluminum thresholds, garage tracks, galvanized posts and anodized window frames all react quickly. On a job with metal in the splash zone we cover it or keep it rinsed the whole time.
Last, acid does not touch oil, grease, tire marks, gum or organic growth. Those need degreasers, hot water, poultices or soft wash chemistry. If your driveway is simply dirty, the right answer is a surface cleaner and hot water, and that costs less than an acid wash. We will tell you that rather than sell you the stronger product.
We walk the surface with you before the hoses go back on the reel. If a section still carries the deposit we came to remove, we stay and work it. 100% satisfaction, guaranteed.
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Valley Wash Pros holds a 4.9-star rating across 644 Google reviews. These are real reviews from our Google Business Profile, in the customers' own words.
"Great service! We had a serious bird problem under our solar panels. Danny and Adrian cleared them out, washed the whole roof with antibacterial rinse and installed critter guard. So far, it's working like a charm! Thank you!"
"Valley Wash Pros are very professional. They accommodated me to schedule an appointment to pressure wash my backyard, front yard, driveway, and garage. They did a great job, and were very pleasant to work with. I highly recommend them."
"5 stars!! Helped us with pigeon issues on our solar and they were super professional, accommodating and courteous!!! Excellent experience, would highly recommend!!!"
Read more on our reviews page or straight from our Google Business Profile.
We acid wash concrete, pavers, brick and pool tile across Fresno and the wider Central Valley.
Fresno water is hard, and it turns up on every surface it touches. Sprinkler overspray leaves a chalky ring around driveways and block walls, evaporative coolers drip mineral streaks down stucco, and pool waterlines build a calcium band every season. Out in the county on well water the problem changes character, and you get iron, the orange staining that runs downhill from one sprinkler head across an entire driveway.
North Fresno and Clovis, with newer pours and heavy irrigation, mostly call about efflorescence on block walls and hard water rings on flatwork. The older parts of town call about brick porches, Saltillo tile and mortar haze that has been building for sixty years. Madera, Visalia, Hanford, Tulare and Merced run the same mix, with more well water iron staining through the ag corridors.
Fresno, Clovis, Madera, Visalia, Hanford, Tulare, Merced and the towns in between. Start at the service area map, or pick your city below. See the full service area.
Acid work usually gets booked alongside these, because the same visit is already set up for water, containment and rinse.
Question not answered here? Call or text (559) 975-8124 and talk to the crew that would actually do the work. Free estimate, straight answers, no pressure.
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Homeowners and businesses across Fresno & the Central Valley trust Valley Wash Pros to get it done right the first time. Here's what they say.
Great service! We had a serious bird problem under our solar panels. Danny and Adrian cleared them out, washed the whole roof with antibacterial rinse and installed critter guard. So far, it's working like a charm! Thank you!
Valley Wash Pros are very professional. They accommodated me to schedule an appointment to pressure wash my backyard, front yard, driveway, and garage. They did a great job, and were very pleasant to work with. I highly recommend them.
5 stars!! Helped us with pigeon issues on our solar and they were super professional, accommodating and courteous!!! Excellent experience, would highly recommend!!!
At Valley Wash Pros, we do careful, thorough pressure washing for both residential and commercial properties.
Our pressure washing team is committed to restoring the beauty of your home with advanced equipment and effective cleaning techniques. Whether it's a driveway, deck, siding, or roof, our high-pressure washing solutions remove dirt, grime, stains, and mildew, ensuring your property looks fresh and well-maintained.
We take pride in our attention to detail, quality service, and customer satisfaction, making us the trusted choice for all your pressure washing needs. With years of experience and a passion for excellence, we guarantee a job done right every time. Choose Valley Wash Pros for your pressure washing needs.
Tell us what you need anywhere in Fresno or the Central Valley. We handle the rest.
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Our crew arrives on time with the right equipment and method for every surface on your property.
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Valley Wash Pros is a Fresno-based, family-run crew serving homes and businesses across Fresno & the Central Valley. We do one thing and we do it right , strip away years of Valley dust, hard-water stains and grime and leave your property looking brand new. No streaks, no shortcuts, no excuses.
Roof & gutter cleaning, solar panel cleaning, bird proofing, house & pressure washing, windows and concrete , we bring the right method and the right pressure to every surface. Fully licensed & insured, satisfaction guaranteed on every job. You point at the mess. We make it disappear.
Based in Fresno, Valley Wash Pros serves homes and businesses across Fresno, Madera, Kings, Tulare and Merced counties, from Clovis to Visalia to Merced. Find your city below.
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