Clean an exposed aggregate driveway with low-pressure washing (1,500 to 2,000 psi at a safe distance with a wide-angle tip) and a mild pH-neutral detergent, not a high-pressure blast that strips the cement paste and loosens stones. For oil, use a dedicated degreaser; for organic growth, use a gentle moss-and-mildew cleaner; and for stubborn rust or mineral stains, use diluted oxalic acid. Always test a small area first, keep the wand moving, and reseal after cleaning to protect the exposed stones.
Exposed aggregate is prized for its texture and traction, but that same pebbled surface is what makes it easy to damage with the wrong cleaning approach. The most common injury we see on exposed aggregate driveways in North Texas is not weathering or age. It is a homeowner with a powerful pressure washer who blasted the surface too hard, stripping away the cement paste that holds the decorative stones in place. Once that happens, stones loosen and pop out, and the repair is far more involved than the cleaning ever needed to be.
TriStar Built has installed and maintained exposed aggregate across Denton County since 2006, and the good news is that cleaning it correctly is simple once you understand what you are protecting. This guide explains why gentle methods matter, the safe pressure and products for routine cleaning, how to handle specific stains, the step-by-step process, and why resealing after cleaning is part of the job. Done right, an exposed aggregate driveway cleans up beautifully and lasts for decades.
An exposed aggregate finish is created by removing the top layer of cement paste during installation to reveal the decorative stones beneath, then relying on the remaining paste and the sealer to lock those stones in place. That structure is exactly what aggressive cleaning threatens.
High-pressure water aimed too close acts like a chisel. It erodes the cement paste between and around the stones, and once enough paste is gone, the aggregate begins to loosen and dislodge. Unlike a smooth slab, where high pressure mostly risks etching, exposed aggregate can suffer actual material loss, which is difficult and costly to repair. The texture that gives the surface its grip and character is also what makes it fragile when exposed to a power washer.
The principle is simple: clean the surface, do not excavate it. Lower pressure, the right detergents, and a sealer that protects the paste all serve that goal. This kind of careful, surface-appropriate work is part of a sound driveway maintenance routine, and it matters even more for decorative finishes like exposed aggregate driveways.
For routine cleaning, the combination of moderate pressure, distance, the right tip, and a mild cleaner does the work without harming the surface. Pressure alone is rarely the answer; the detergent does most of the cleaning while the water simply rinses.
| Cleaning Need | Recommended Approach | What to Avoid |
|---|---|---|
| Routine dirt and grime | 1,500 to 2,000 psi, 25 to 40 degree wide tip, 12+ inches away | Narrow 0 or 15 degree tips up close |
| General wash | Mild pH-neutral detergent and a soft-bristle push broom | Harsh acids on the whole surface |
| Oil and grease | Dedicated concrete degreaser, dwell time, then rinse | Scrubbing with wire brushes |
| Moss, mildew, algae | Gentle moss-and-mildew cleaner or diluted oxalic for stains | Chlorine bleach at high concentration on color |
| Rust or mineral stains | Diluted oxalic acid, spot-applied and rinsed | Muriatic acid on decorative surfaces |
The key numbers: keep pressure in the 1,500 to 2,000 psi range, use a wide-angle tip (25 to 40 degrees), and hold the wand at least a foot from the surface, farther if the paste seems at all loose. Let detergents do the chemical work so the water pressure can stay low. The EPA encourages choosing the least aggressive effective cleaner, which, on exposed aggregate is also what best protects the surface.
Different stains call for different treatments, and matching the treatment to the stain prevents both damage and frustration.
In every case, test the product on a small, inconspicuous area first, and rinse thoroughly to ensure no cleaner residue remains to attract dirt or interfere with resealing. When a stain resists gentle methods, it is better to repeat a mild treatment or call a professional than to escalate to high pressure or harsh acid.
Safe, effective cleaning of an exposed-aggregate driveway follows a simple sequence that prioritizes the surface at every step.
The two habits that prevent almost all damage are keeping the wand moving and keeping it back. Lingering in one place or moving in close concentrates energy on the paste, which is exactly what you are trying to preserve. Steady, overlapping passes from a safe distance clean evenly without erosion.
Cleaning and resealing belong together on an exposed aggregate driveway. The sealer is part of what holds the stones in place and repels the dirt, oil, and moisture that make the surface hard to keep clean in the first place. Washing can wear or thin an aging sealer, so a clean driveway is the right moment to reapply.
On exposed aggregate, sealing also keeps the texture looking crisp by repelling grime that settles in the pockets between stones, and many homeowners prefer a sealer that adds a slight sheen to enhance the stones' appearance. Both the Portland Cement Association and the American Concrete Institute stress matching the sealer to the surface and exposure, which for decorative aggregate in North Texas, means a quality, breathable product applied to a fully dry slab. Because the reseal interval and product choice follow the same logic as any decorative concrete, the same concrete driveway sealing basics apply directly here. The short version: clean gently, let it dry fully, and reseal to protect what you just cleaned.
Yes, but carefully. Keep pressure in the 1,500 to 2,000 psi range, use a wide-angle tip (25 to 40 degrees), hold the wand at least a foot from the surface, and keep it moving in steady passes. The danger is using a narrow tip up close at high pressure, which erodes the cement paste and loosens the decorative stones. Let detergents do the cleaning so the water pressure can stay low.
For exposed aggregate, stay around 1,500 to 2,000 psi with a wide-angle tip and a safe distance of at least a foot. Higher pressures, especially with narrow tips held close, risk stripping the paste that holds the stones. If the paste already seems worn or stones feel loose, reduce pressure further or rely mainly on detergent and a soft broom rather than the washer.
Use a dedicated concrete degreaser. Apply it to the stain, let it dwell per the product instructions, agitate gently with a soft-bristle brush, and rinse at low pressure. Fresh spills are easiest to remove, so treat them promptly. Avoid wire brushes and high pressure, which can scratch the stones and dislodge paste while trying to lift the stain.
Organic growth is common on shaded North Texas driveways. Apply a gentle moss-and-mildew cleaner, let it work according to the label, and rinse at low pressure. To reduce recurrence, improve drainage so water does not linger and trim back overhanging vegetation to let more sun reach the surface. Avoid high-concentration bleach on decorative or colored surfaces.
Not if you clean gently. Damage comes from high pressure and harsh acids, not from mild detergents and moderate pressure. Use pH-neutral cleaners, test any product on a small area first, keep pressure moderate, and avoid muriatic acid on decorative surfaces. The combination of gentle products and careful technique cleans the surface thoroughly without harming the stones or any integral color.
Yes. The sealer helps hold the stones in place and repels the dirt, oil, and moisture that make the surface hard to keep clean. Washing can wear an aging sealer, so a freshly cleaned, fully dried driveway is the ideal time to reapply. Resealing protects the surface you just cleaned and keeps the aggregate texture looking crisp for longer.
An exposed aggregate driveway is meant to last for decades, and cleaning it is easy as long as you respect what makes it special: the cement paste that grips the decorative stones. Moderate pressure, the right detergent for each stain, steady technique, and a fresh coat of sealer afterward keep the surface beautiful without ever putting it at risk. The only real mistake is treating a delicate decorative surface like a plain slab and blasting it.
If your exposed aggregate driveway needs cleaning, resealing, or repair after past damage in Denton, Argyle, Flower Mound, Highland Village, Corinth, or anywhere across Denton County, TriStar Built is glad to help. If you would rather leave it to a pro, see our concrete cleaning and pressure washing. Call (940) 381-2222 or visit www.tristarbuilt.com. We have cared for North Texas decorative concrete since 2006, and we know how to make it look new without taking the stones with it.
Whether you’re remodeling a home, expanding a business, or starting from the ground up, TriStar Built is here to guide you every step of the way. With a focus on craftsmanship, communication, and results that last, we make the construction process clear, smooth, and worth every investment.
LOCATION: 2126 James Street, Denton, TX 76205
PHONE: (940) 381-2222
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