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What is the difference between pressure washing and soft washing?

Pressure Washing:

High pressure or power washing is what most people think of when they hear the
term “pressure washing”. Water is pressurized and used to penetrate deep into
surfaces through sheer force. With high-pressure around 1500-3500 psi.

High pressure water is sprayed to remove loose paint, stains, mud, chewing gum
and dirt from surfaces and objects such as buildings, concrete, brick, metal, or wood
surfaces.

We can use cold or hot water up to 215 degrees fahrenheit.

Pressure washing is performed to reduce allergies, minimize hazards, and improve
aesthetics.

A pressure washer is used to clean surfaces such as: Gutters, decks, sidewalks,
patios, driveways, parking lots, decks, and fences.

Pressure washing requires skills and can cause damage if not done correctly.
Highest pressure is only recommended for very resilient surfaces. We do not
recommend getting certain things pressure washed.

Soft Washing:

Soft washing Equipment is different than pressure washing equipment.

Is a cleaning method that only requires low pressure around 80-300 psi.
This service is the opposite of pressure washing and low pressure washing.
It requires a special mixed solution (typically sodium hypochlorite, water, and
a surfactant) to safely remove algae, mildew, bacteria, moss and other organic stains
from roofs and other delicate exteriors surfaces.

The Asphalt Roofing Manufacturers Association recommends soft washing asphalt roofs
to prevent damage to the shingles.

Soft Washing should be used on surfaces that are notoriously hard to get clean with
pressure or would be damaged if one were to use high pressure on them such as
windows, roof shingles, vinyl siding, screens, painted surfaces, etc.