You Might Smell Bleach — Here's Why
If you're home during a soft-wash service and catch a faint bleach smell from outside, that's the sodium hypochlorite in our cleaning solution doing exactly what it's supposed to do. It's the same active ingredient in the bleach you use on laundry or to sanitize a cutting board — just applied to your exterior surfaces at a controlled concentration.
We want you to understand exactly what we're using, why we're using it, and what happens to it after we're done.
Sodium Hypochlorite (SH)
Sodium hypochlorite is the primary cleaning agent in professional soft-wash. It's not a mystery chemical — it's the same compound that municipal water treatment facilities use to disinfect drinking water, and that hospitals use to sterilize surfaces. What it does: It kills organic growth — algae, mold, mildew, bacteria, and lichen — at the cellular level. This is why soft-wash results last much longer than pressure washing. The organism is dead, not just physically removed. What concentration we use: Household bleach is typically 3–6% sodium hypochlorite. We work with a professional-grade solution that we dilute on-site to the appropriate concentration for each surface — typically 1–3% on most exterior surfaces. Roofs, where the growth tends to be more established, may get up to 4–6% concentration with a thorough rinse afterward. What it breaks down into: After sodium hypochlorite is applied and rinsed, it rapidly breaks down into salt and water. It does not persist in the environment. Sunlight and organic matter both accelerate this decomposition.
Surfactants
We add a surfactant to every mix. A surfactant is a surface-active agent — it lowers the surface tension of water so our solution spreads evenly and clings to vertical surfaces instead of running straight off.
The surfactants we use are biodegradable. Many share chemistry with common dish soap. They help the cleaning solution work more efficiently so we can use a lower concentration of sodium hypochlorite to achieve the same result.
What About My Plants?
This is the question we hear most often, and it's the right question to ask.
Undiluted sodium hypochlorite at professional concentrations will damage plant tissue if it contacts leaves for an extended period. This is why plant protection is a standard part of every job we do — not an afterthought. Our plant protection protocol:
In practice, the brief contact time and thorough rinsing mean that established plants, shrubs, and grass experience no lasting effect. We've completed hundreds of washes in the Tri-Cities area without plant damage when this protocol is followed correctly.
If you have particularly delicate or irreplaceable plantings — heritage roses, new transplants, vegetable gardens — let us know before we start. We'll take additional precautions or adjust our application approach.
After the Rinse
Once we've rinsed the surface and surrounding vegetation, the diluted sodium hypochlorite on the ground breaks down rapidly — typically within 30 minutes to a few hours depending on sunlight and soil conditions. It does not accumulate in soil or groundwater at the concentrations and quantities used in residential exterior cleaning.
Pets and children can return to the area once surfaces are dry — generally within 30–60 minutes after we finish. If you have questions about timing for your specific situation, just ask us.
Ready to schedule or want to ask more questions first? Request a free quote and we'll answer anything you'd like to know about our process.