Treatment + low pressure
Often suited to organic growth on compatible siding and delicate exteriors. The material, finish, product, and application all matter.
Pressure & soft washing / Homeowner guide
Know your exterior
What’s growing
on your home?
Green siding. Dark streaks. Moss between the pavers. Learn what you’re seeing—and which cleaning approach makes sense for your property.
Harris Hive Groundworks · Tacoma, Puyallup, Spanaway & the South Sound
Low pressure. Purposeful cleaning.
What is soft washing?
Soft washing combines a surface-appropriate cleaning solution with low-pressure application to loosen and treat organic buildup. The treatment does much of the cleaning work, followed by rinsing when the product and surface call for it.
It can be a good fit for suitable siding and other sensitive exterior materials. We assess the surface first: the right approach for concrete may be very different from the one for painted siding or roofing.
Controlled water force
Useful for appropriate durable surfaces, such as sound concrete. Pressure and technique still need to match the material and condition.
Your exterior field guide
Find the closest match.
These clues help you describe the problem. Photos are a starting point; similar-looking stains can have different causes.
AI-generated identification illustrations—not customer job photos or promised results.
Organic growth
Green algae
Look for: A thin green film or wash of color, often on shaded siding, fences, or paving.
What helps: A surface-appropriate soft wash can remove algae and its staining. Reducing persistent moisture helps limit its return.
Assessment needed
Black organic staining / mildew
Look for: Dark speckles, patches, or streaks. Roof streaks are often algae; color alone cannot identify mold or mildew.
What helps: We assess the surface and likely cause first. Organic staining may respond to soft washing; soot, runoff marks, or weathering need a different approach.
Organic growth
Moss
Look for: Raised, soft-looking green cushions, especially in paver joints and on damp, shaded surfaces.
What helps: Treatment and removal depend on the material. Roof moss needs particular care; attached growth may release gradually rather than all at once.
Organic growth
Lichen
Look for: Flat or crusty gray, pale green, or yellowish patches attached firmly to stone, shingles, or other surfaces.
What helps: Lichen can be stubborn. Gentle treatment and time may be needed; aggressive scraping can damage the surface beneath it.
Weathering · separate treatment
Oxidation / chalking
Look for: Faded or uneven siding with a powdery residue that may transfer to a hand. This is weathered material, not organic growth.
What helps: A standard wash does not restore a deteriorated finish. We assess whether separate restoration or refinishing is appropriate.
Specialty stain
Rust
Look for: Orange, reddish-brown, or brown trails near metal fixtures, fasteners, furniture, or irrigation.
What helps: Rust may need a compatible specialty treatment and attention to its source. Removal depends on the surface and how deeply the stain has penetrated.
Specialty stain
Oil / grease
Look for: Dark, irregular patches on driveways or near vehicles and outdoor cooking areas; some may feel greasy.
What helps: Degreasing and surface-specific cleaning may improve the stain. Old oil absorbed into porous concrete can leave a shadow.
Specialty stain
Hard-water / mineral staining
Look for: White crust, rings, or cloudy deposits near sprinklers, faucets, or runoff. White salts on masonry may be efflorescence.
What helps: We identify the deposit and material before choosing treatment. Correcting leaks or sprinkler overspray can help prevent recurrence.
Algae or oxidation? You don’t need to guess.
Send an overview and a close-up taken safely from the ground. We’ll help narrow down the cause and recommend the next step.
Keep the clean going
Treat the buildup.
Reduce the conditions.
Soft washing addresses existing organic growth; it does not make an outdoor surface permanently growth-proof. Moisture, shade, airborne spores, and debris remain part of life in the Pacific Northwest.
- Keep gutters and drainage working so water does not linger.
- Clear accumulated leaves and debris using methods appropriate for the surface.
- Maintain space around siding and improve airflow where practical.
- Check shaded, damp areas periodically and address new buildup early.
A plan for your property
What to expect from the Hive.
Assess
Review the surface, condition, stains, access, and likely results.
Prepare
Plan protection for landscaping, vulnerable materials, and surrounding areas.
Clean
Use the agreed method and product directions, with suitable application and rinsing.
Review
Check the result and explain remaining marks, care, or any follow-up.
Straight answers
Before you book.
Will soft washing damage my siding or roof?
Low pressure reduces the risks of forceful washing, but material condition and solution compatibility still matter. We look for failing paint, oxidation, loose siding, gaps, and vulnerable finishes before recommending a method. Asphalt shingles should not be pressure washed; roofing guidance is specific to the manufacturer and material.
Does it treat the growth, or just hide the stain?
Soft washing uses a cleaning treatment and contact time to address organic buildup and discoloration. It is not paint or a cover-up. The product, application, and rinse must suit the surface and be used according to its label; a clean-looking surface is not proof of disinfection.
Will algae or moss come back? How long will it stay clean?
Growth can return. Shade, dampness, nearby trees, drainage, and surface condition all affect timing, so there is no universal clean-for-years promise. Treatment addresses existing buildup; keeping gutters clear, improving drainage, and maintaining airflow can make the environment less favorable for regrowth. Reassess periodically and clean when needed.
What about my plants, lawn, and landscaping?
Cleaning products can affect plants. Tell us about delicate landscaping, edible gardens, ponds, and sensitive materials before work begins. The preparation plan may include wetting and rinsing vegetation, protecting vulnerable areas, and managing overspray and runoff. We will discuss site-specific precautions during the assessment.
Can my kids and pets stay outside?
Keep children and pets away from the active work area, equipment, and runoff. Re-entry depends on the product label and site conditions. Follow the crew’s instructions after rinsing and any required drying or waiting period; do not assume the area is ready simply because spraying has stopped.
Will every mark disappear?
No. Organic growth, rust, oil, mineral deposits, and oxidation have different causes. Cleaning cannot repair deteriorated paint or damaged material, and deeply absorbed stains can remain. We explain likely results and any separate treatment before you approve the work.
Why not just use a pressure washer—or do it myself?
Pressure can suit sound concrete and some hard surfaces, but excessive force can damage siding, wood, paint, seals, or roofing. Homeowner cleaning also requires the correct product, material compatibility, runoff control, and safe access. Never mix cleaning products. Send ground-level photos if you are unsure what you are dealing with.
Will moss and lichen disappear immediately?
Not always. Firmly attached growth may need time to release after treatment, particularly on roofing. We discuss the expected appearance and any follow-up so there are no surprises. Forcing it off can damage the surface.
How much does it cost, and do I have to book?
The assessment is free. Price depends on the surfaces, area, access, height, buildup, and any specialty treatments. Upload photos and details for review; we may recommend an on-site visit. You can review the scope and price before approving work. An assessment request does not create a service appointment.
How should I prepare for a visit?
Tell us about leaks, damaged finishes, delicate plants, pets, and any special concerns. Close windows and doors, move portable belongings when practical, and keep the work area accessible. We will confirm any additional preparation and water-access needs before the visit.
Further reading: ARMA roof-cleaning guidance and OSU Extension on roof moss and prevention.
Let’s take a look
A cleaner exterior starts
with the right assessment.
Upload a few photos, tell us what you’re noticing, and share your service address. We’ll review the details and help you choose the next step.
No booking commitment. Clear scope and pricing before you approve work.