Will power washing remove mold?

Yes — power washing can remove mold, but the key to eliminating mold safely and permanently is using the correct cleaning method. While high-pressure water may remove the visible mold on the surface, it does not kill the underlying spores, meaning the mold will return quickly, often thicker than before.

Professional contractors listed in the PowerWashing.com Directory use a technique called soft washing, which relies on low pressure and specially formulated detergents to kill mold at the root level, sanitize the surface, and provide long-lasting results.

Below is the full explanation of how mold removal works and why the method matters.

⭐ 1. Mold Removal Requires Chemistry, Not Just Pressure

Mold is a living organism.
 If you only blast it with water:

• You remove the dark surface staining
• But you leave the spores behind
• And the mold returns within weeks

Soft washing uses detergents that:

• Kill mold, algae, and mildew at the cellular level
• Break down organic growth roots
• Prevent regrowth for months or years
• Clean safely without damaging property

This is the same process recommended by roofing manufacturers, siding manufacturers, and industry safety standards.

⭐ 2. Why High Pressure Is NOT the Right Way to Remove Mold

Using high pressure on mold can actually cause more harm:

• Drives spores deeper into porous surfaces
• Spreads mold, causing faster regrowth
• Damages siding or stucco
• Removes paint prematurely
• Forces water behind your walls or into insulation
• Causes costly structural moisture issues

This is why professional contractors avoid high pressure on siding, stucco, roofs, and other delicate surfaces.

⭐ 3. Best Method: Soft Washing (Low Pressure + Detergent)

Soft washing is the industry standard for treating mold on:

• Siding (vinyl, stucco, wood, Hardie board)
• Brick and masonry
• Roof shingles
• Patio covers and pergolas
• Pool decks
• Fences
• Outdoor furniture
• Painted surfaces

Soft washing uses:

• Low PSI (100–300 PSI)
• Bio-safe detergents
• Surfactants for cling
• Extended dwell time
• Rinse cycles that protect landscaping

This approach removes mold fully and keeps surfaces clean longer.

⭐ 4. Mold Grows Faster in Certain Conditions

Power washing is especially helpful for properties located in:

• Humid or coastal regions
• Shaded areas with tree cover
• Mulch-rich landscaping
• North-facing walls
• Homes near lakes, rivers, or golf courses

These environments create ideal moisture conditions for mold and algae to thrive.

Routine maintenance through a PowerWashing.com professional helps prevent long-term staining and structural degradation.

⭐ 5. Does Mold Removal Need to Be Done Every Year?

Usually, mold-free results last:

• 12–24 months for siding
• 2–3 years for roofs (with proper treatment)

If mold returns sooner than expected, it’s usually due to:

• Poor drainage
• Overgrown vegetation
• Overuse of sprinklers
• Lack of sunlight
• Heavy humidity

Professionals can recommend a custom cleaning schedule.

⭐ 6. Is Professional Mold Removal Worth It?

Yes, because:

• It protects your siding, roof, and paint
• Prevents organic damage and rot
• Keeps your home’s exterior healthy
• Improves curb appeal
• Increases property value
• Prevents DIY damage

Homeowners who hire through PowerWashing.com get trained experts who understand surface chemistry, safe techniques, and mold remediation best practices.