Dirt Splash Marks Along the Bottom of Your Walls

What the brown band is

Splashback is dirt carried onto the wall by water hitting the ground. When raindrops or sprinkler spray land on bare soil, mulch or gravel near the house, they kick up muddy droplets that stick to the wall. Over a season, those droplets build into a brown or reddish band, usually darkest at the bottom and fading out a foot or two up.

The good news is that it is surface dirt in most cases. A proper wash removes most or all of it, especially if it is cleaned before it has years to settle in.

Why stucco shows it so clearly

Stucco is textured and porous. Its peaks and valleys catch fine soil, and the material wicks moisture, pulling a little of the stain into the surface. Light-colored stucco, very common on LA homes, makes the contrast obvious.

Stucco walls often end at a weep screed, the metal strip at the bottom of the wall that lets moisture escape. When soil or mulch is piled up close to or over that strip, splashback gets worse and the bottom of the wall stays damp longer, which can invite mildew too.

How to clean it

Start by wetting the wall so the stucco is not absorbing everything you apply. Then apply a mild house wash solution to the stained band and let it dwell for a few minutes. That loosens soil from the texture far better than pressure alone. Rinse from the top of the stained area down, with low pressure and a wide fan, holding the wand at a comfortable distance from the wall.

For stubborn spots, a soft brush helps work the solution into the texture. Avoid high pressure close to stucco. It can etch the finish, blow out the texture, or leave a lighter stripe that looks worse than the dirt. Our guide on whether pressure washing is safe for stucco explains why.

Clay-rich soils can leave a reddish tint that only lightens with one wash. If the stain is old and has soaked deep, expect improvement, not perfection. If the wall has been patched or painted, the cleaned band may look slightly different from the rest, and that is a paint or fading issue, not a cleaning one.

Stopping it at the source

The real fix is changing what sits next to the wall. A strip of gravel or decomposed granite along the base splashes far less than bare dirt or loose bark mulch. Keeping soil and mulch a few inches below the weep screed also helps the wall dry out.

Sprinklers are often a bigger cause than rain. Spray heads aimed at the wall, or set too close to it, splash dirt on every cycle and keep the base wet. Adjusting heads to spray away from the house, switching beds near the wall to drip irrigation, or moving plants slightly out from the foundation can make a big difference. Gutters and downspouts matter too. A downspout dumping onto bare soil right at the wall creates a splash zone, so add a splash block or extension to carry water away.

Timing the cleaning

In LA, splashback builds up most during the rainy season, roughly November through March, when heavy storms hit bare yards. Cleaning in spring removes the winter buildup while it is still fresh. If you fix the landscaping first, the clean wall stays clean much longer.

If you are washing the whole house anyway, include the base. If only the bottom band is dirty, a spot cleaning may be all you need. Our post on why stucco looks faded covers the difference between dirt and sun fading on the rest of the wall.

Cost and what to expect

Splashback is usually handled as part of a house wash, which runs $0.35 per square foot of exterior wall as of October 2026, with a $195 minimum per visit. At Say Wash It we pre-wet the plants along the base, clean the stained band carefully, and point out any sprinkler heads hitting the wall during the final walkthrough. The instant quote on this page gives you a starting number, and the flat price is confirmed before any work begins.