Troubleshooting reference
Start with symptoms, rule out homeowner-safe basics, and escalate conservatively when safety, structure, utility service, or water damage is involved.
Routine
Siding looks streaky or oxidized after washing
Likely causes
- Too much pressure
- Oxidation not tested
- Improper detergent dwell/rinse
Homeowner-safe check
Stop scrubbing aggressively; oxidation can be removed unevenly.
When to call
Call a soft-wash pro if oxidation removal or warranty claim is needed.
Call soon
Water enters around windows, doors, or outlets
Likely causes
- Pressure forced behind seals
- Failed caulk/flashing
- Electrical covers not protected
Homeowner-safe check
Turn off affected exterior circuits if safe and dry interiors quickly.
When to call
Call promptly if outlets got wet, drywall is wet, or leaks continue in rain.
Routine
Deck fibers fuzz or boards gouge
Likely causes
- Pressure too high
- Tip too narrow
- Washing too close
Homeowner-safe check
Let wood dry and avoid sanding until moisture content is appropriate.
When to call
Call for restoration if damage is widespread or before staining/sealing.
Call soon
Roof shingles lose granules after washing
Likely causes
- Pressure washing asphalt shingles
- Aged shingles
- Wrong chemical/rinse method
Homeowner-safe check
Stop work immediately; asphalt shingles should be cleaned by approved low-pressure methods.
When to call
Call a roofer if granule loss exposes mat or leaks appear.
Routine
Plants burn after house wash
Likely causes
- Sodium hypochlorite exposure
- Insufficient pre/post rinse
- Runoff concentration
Homeowner-safe check
Rinse plants with water and keep soil moist; photograph damage quickly.
When to call
Call contractor for plant-care/remediation terms if damage spreads.
Routine
Concrete stripes or wand marks remain
Likely causes
- Uneven passes
- No surface cleaner
- Etching from high pressure
Homeowner-safe check
Do not keep chasing stripes with closer nozzle passes.
When to call
Call routinely for even surface-cleaner pass or concrete restoration if etched.
Routine
Paint peels during washing
Likely causes
- Failing coating
- Too much pressure
- Moisture behind paint
Homeowner-safe check
Stop washing the area and test adhesion elsewhere before continuing.
When to call
Call painter or washing pro to separate prep failure from washing damage.
Call soon
Wastewater flows into storm drain
Likely causes
- No containment
- Detergent/paint chips in runoff
- Regulatory compliance gap
Homeowner-safe check
Stop discharge where safe and avoid washing lead paint or oily surfaces without containment.
When to call
Call a contractor with wastewater plan for commercial, oily, or lead-sensitive work.
Routine
Black roof algae returns quickly
Likely causes
- Treatment too weak
- No dwell time
- Overhanging trees and moisture
Homeowner-safe check
Confirm cleaner was roof-rated and do not pressure-wash retreatment.
When to call
Call for soft-wash retreatment and prevention plan.
Routine
Quote says one PSI works for every surface
Likely causes
- No soft-wash knowledge
- Surface damage risk
- Insurance/warranty gap
Homeowner-safe check
Ask for surface-specific method, detergents, plant protection, and wastewater plan.
When to call
Call another provider if they cannot explain low-pressure vs high-pressure use.
Maintenance schedule
Seasonal tasks
Spring
- In spring, identify oxidized siding, loose paint, failing caulk, and unsealed outlets before scheduling a wash.
Summer
- During summer algae season, water plants before and after soft washing and keep pets away until surfaces are rinsed.
Fall
- Before fall, clean slippery north-facing walks and steps with a method that will not etch concrete or stone.
Winter
- In winter climates, avoid washing when runoff will freeze on drives, walks, thresholds, or public sidewalks.
Interval tasks
Monthly
- Monthly, note mildew return, gutter tiger stripes, rust stains, battery-acid spots, and surfaces with previous coating failure.
Annual
- Yearly, review which surfaces need low-pressure detergent rather than high-pressure cleaning, especially roofs, stucco, and older decks.
Every few years
- Every few years, reassess sealed concrete, paver sand, painted trim, and wood fibers before repeating the same cleaning approach.
Cost components
Labor
A realistic labor line covers site protection, chemistry selection, dwell time, low/high-pressure technique, ladder/access work, runoff control, and post-rinse inspection, then adjusts for surface testing, detergent selection, plant protection, lift access, runoff control, and delicate rinse work.
Materials
Material pricing should call out surfactants, sodium hypochlorite mixes, neutralizers, tips, hoses, surface cleaners, tarps, and pump parts; the baseline remains detergents, sodium hypochlorite mixes, surfactants, fuel, tips, surface cleaners, hoses, plant protection, neutralizers, and PPE.
Permits and inspections
Do not leave permitting vague when the scope includes wastewater capture, commercial sites, lead paint, roof cleaning rules, and storm-drain restrictions. Inspection ownership affects schedule.
Broad range discipline
The range changes at a rinse, soft wash, concrete restoration, roof treatment, and regulated cleanup. Small flatwork cleaning is modest; whole-house soft washing, roof washing, oxidation removal, and multi-surface restoration increase cost.
What moves price
Pushes price up
- Roof or high access; added cost is usually tied to surface testing
- Oxidation/restoration; added cost is usually tied to detergent selection
- Plant/runoff protection; added cost is usually tied to plant protection
- Heavy staining or large surface area; added cost is usually tied to lift access
Can reduce price
- Ground-level flatwork; lower pricing is likelier when surfactants is clearly defined
- Clear water access; lower pricing is likelier when sodium hypochlorite mixes is clearly defined
- Routine maintenance staining; lower pricing is likelier when neutralizers is clearly defined
- Bundled surfaces in one visit; lower pricing is likelier when tips is clearly defined
Hiring red flags
- The written scope cannot point to one pressure setting promised for roof, siding, deck, and concrete when challenged.
- There is no measurable way in the proposal to verify oxidation testing before washing vinyl or metal siding.
- The bargain price omits plant wet-down, neutralization, and runoff control before any photo record exists.
- Post-job coverage is vague about water intrusion, paint loss, etched concrete, and shingle damage exclusions and return timing.
- Uses high pressure on every surface.
- No plant protection or chemical disclosure.
- Pressure-washes asphalt shingles.
- No wastewater plan for oily, lead-painted, or commercial surfaces.
Contract checklist
- Surface list, material condition, oxidation test, loose paint, failed caulk, and delicate fixture protection with brands, sizes, locations, and exclusions.
- Soft-wash or pressure method, detergents, dwell time, nozzle type, PSI range, and rinse sequence before work starts, including who schedules inspections.
- Plant protection, water source, electrical covers, window precautions, runoff containment, and storm-drain rules for access, protection, cleanup, and disposal.
- Exclusions for roof granules, deck fuzzing, paver sand, failed coatings, efflorescence, and pre-existing stains as unit pricing or written allowances.
- Before/after photos, weather limits, access needs, drying expectations, and callback process for streaks; final acceptance includes photos, manuals, warranty entries, and lien-release records.
- Surfaces included, cleaning method/pressure, detergents, and stain expectations.
- Plant/electrical/window/door protection and runoff plan.
- Water source, access, weather limits, and drying/traffic timing.
- Exclusions for oxidation, failing paint, loose mortar, old wood, and roof granules.
- Insurance, damage process, and photo documentation before/after.
Warranty norms
Pressure-washing callbacks usually address missed streaks or uneven cleaning, not damage from surfaces that were already oxidized, loose, rotten, or improperly coated. Roof, deck, plant, runoff, and water-intrusion risks should be acknowledged before work starts.