If you've ever searched for exterior cleaning services, you've probably seen both "pressure washing" and "soft washing" thrown around — sometimes interchangeably. But they're actually very different methods, and using the wrong one on the wrong surface can cause real damage. As a professional exterior cleaning company servicing all of Northwest Indiana, we use both methods daily, and knowing when to use each one is what separates a quality job from a costly mistake.
What Is Pressure Washing?
Pressure washing uses high-pressure water — typically 2,500 to 4,000 PSI — to blast away dirt, grime, and stains from hard surfaces. The power comes from the water velocity itself.
Best for: Concrete driveways, sidewalks, patios, brick pavers, and stone surfaces. These materials can handle the force without damage.
Not recommended for: Vinyl siding, wood, painted surfaces, roofing shingles, or windows. High pressure can crack vinyl, splinter wood fibers, strip paint, and blow water behind siding panels where it causes hidden mold growth.
What Is Soft Washing?
Soft washing uses low-pressure water (under 500 PSI — about the same as a garden hose) combined with specialized biodegradable cleaning solutions. The chemicals do the work, not the pressure. The solution kills organic growth like algae, mold, mildew, and bacteria at the root, and the low-pressure rinse washes everything away.
Best for: Vinyl siding, hardie board, stucco, painted wood, roofing shingles, cedar shake, fences, and outdoor furniture.
Why it's better for these surfaces: The cleaning solution penetrates pores and kills growth at the cellular level. Pressure washing only removes the visible surface layer — meaning algae grows back in weeks instead of months.
The Real Danger of Using the Wrong Method
We regularly get calls from homeowners who hired a company that pressure washed their vinyl siding or roof shingles. Here's what happens:
- Vinyl siding: High pressure forces water behind the panels, creating a moisture trap that breeds mold you can't see. It also cracks and warps vinyl, especially in cold weather. - Roof shingles: Pressure strips the protective granule coating off asphalt shingles, dramatically shortening their lifespan and potentially voiding your manufacturer warranty. - Wood: Too much pressure splinters wood fibers, leaving a rough, damaged surface that absorbs water and rots faster.
The repair costs from pressure washing the wrong surface almost always exceed the cost of having it cleaned correctly in the first place.
So Which One Does Your Home Need?
In most cases, a full exterior cleaning job uses both methods:
- Soft wash for the house siding, roof, soffits, fascia, and gutters - Pressure wash for the concrete driveway, sidewalks, patio, and any hard surfaces
This is exactly how we approach every job at NWI Pressure Washing. We assess every surface on your property and match the right method to the right material. No shortcuts, no one-size-fits-all approach.
How Much Does Each Cost?
In Northwest Indiana, a full house wash using soft wash methods typically runs $200 to $500 depending on home size. Concrete cleaning for a standard driveway is usually $100 to $300. Most homeowners combine both services for a complete exterior refresh.
The price difference between soft washing and pressure washing is negligible — the real cost difference is in the damage that comes from using the wrong method.
Bottom Line
When you're hiring someone to clean your home's exterior, ask them one question: "Do you soft wash or pressure wash the siding?" If they say pressure wash, keep looking. Any reputable exterior cleaning company knows that siding, roofing, and wood surfaces require soft washing — period.
At NWI Pressure Washing, soft washing isn't an upsell — it's our standard. Every house wash we do uses our low-pressure soft wash system with biodegradable cleaning solutions. It's the only way to clean safely and effectively.
