house washing
Mold, Mildew & House Washing in Tampa Bay: Every Question, Answered
Quick Answer: The black or green growth on your Tampa Bay home’s exterior is mold, mildew, or algae — all accelerated by Florida humidity and shade. It should be removed every 12–24 months with a professional soft wash. Left alone, it can damage paint, spread under siding, and lower curb appeal and home value.
Tampa Bay’s humidity is a mold and mildew greenhouse. Every untreated stucco wall, every shaded north-facing side, every painted soffit — they all grow something within 18 months.
Here’s every question Tampa Bay homeowners ask us about house washing, mold, mildew, and what’s actually growing on their walls. We answered all of them based on 15 years of cleaning across Pinellas, Pasco, and Hillsborough.
The basics
How often should I wash my house in Tampa Bay?
| Siding type | Frequency |
|---|---|
| Vinyl siding | Every 12–18 months |
| Stucco | Every 12–24 months |
| Brick / Hardie board | Every 18–24 months |
| Painted wood | Every 12 months (longer-life paint extends to 18) |
| Aluminum | Every 18–24 months |
The rule: if you see discoloration on the shaded sides of your house, it’s time.
What’s actually growing on my house?
Tampa Bay walls grow some mix of:
- Mildew (Cladosporium and Aspergillus species) — green-black surface fuzz
- Mold (various species) — usually pink, white, or black patches
- Algae (Aerococcus, Pleurococcus) — green film on shaded surfaces
- Lichen (mineral-anchored fungi) — gray-green crusty patches, hardest to remove
- Pollen + organic film — yellow-tan layer accumulating in still air zones
- Salt spray + sulfur deposits (coastal homes) — white crystalline residue
Each requires slightly different soft wash chemistry. Trained technicians identify what’s growing before applying the right solution.
Is mold on my house dangerous?
The mold growing on exterior stucco or siding is rarely the same species that causes indoor air quality issues. The exterior species are surface organisms that thrive in UV-exposed environments. They look ugly and damage paint, but they’re not the dangerous “toxic mold” you hear about indoors.
However, if exterior mold spreads into vinyl siding seams, behind stucco, or into soffit/fascia woodwork — it can begin to penetrate the building envelope. At that point, it’s both an aesthetic and a structural concern.
The rule: don’t ignore it. Clean every 12–24 months.
Will pressure washing kill mold?
No. Pressure washing removes the surface colonies but leaves the cellular foundation in the pores of the material. Mold returns within 3–6 months because the underlying spores survived the blast.
Soft wash uses biodegradable chemistry that kills mold and mildew at the cellular level. Properly applied soft wash prevents regrowth for 12–24 months — 3–4x longer than pressure washing alone.
Soft wash vs pressure wash full guide →
Will pressure washing damage my siding?
Yes. High-pressure water on vinyl siding cracks the seal between panels, lets water behind the wall, and accelerates color fade by stripping the protective top layer. Most vinyl manufacturers (CertainTeed, Mastic, etc.) explicitly void warranty for pressure washing.
Same applies to stucco (erodes finish), Hardie board (chips edges), and painted wood (strips paint).
The cleaning process
What’s included in a Sandbar house wash?
A full house wash covers:
- All exterior siding (vinyl, stucco, brick, Hardie, painted wood)
- Soffit and fascia (the underside of eaves)
- Downspouts and gutter exteriors
- Window frames (not the glass — we don’t squeegee, that’s a window service)
- Front and back doors
- Garage door
- Walkway leading to front door (if requested)
We don’t include:
- Roof (separate service — bundle for 10% off)
- Windows interior (use a window cleaner)
- Driveway pressure washing (separate service)
- Pool cage/lanai (separate service)
How long does a typical Tampa Bay house wash take?
- Single-story under 2,000 sqft: 2–3 hours
- 2-story 2,000–3,500 sqft: 3–5 hours
- Large 3,500+ sqft: 5–7 hours
Most homes are done in a single day.
Do I need to be home?
No. Most customers leave a gate code or key with us. We’re licensed and insured.
Will I see results immediately?
Yes. Soft wash chemistry kills the mold and mildew on contact. You’ll see clean walls within 60 seconds of application + rinse. Color comes back to underlying paint that the mildew was hiding.
Will my house look like it did when it was new?
Mostly. Soft wash can’t reverse paint UV fade or repair damaged stucco. It removes the biological growth covering your house — which is usually 80% of what makes a house “look old.” For repainting needs, we can refer you to local Tampa Bay painters.
Plant + pet safety
Will the chemistry hurt my plants?
Not when properly applied with pre-rinse, post-rinse, and homeowner pre/post-watering. Industry-standard cleaning solutions are biodegradable and break down into salt + water in sunlight within 4 hours.
We require homeowners to water landscaping the morning of service and within 24 hours after. Full plant protection guide →
What about pets?
Keep pets indoors during application. They can return to the yard 4 hours after we leave (full sunlight breaks down the solution). Outdoor water bowls should be brought in or covered.
What about fish ponds?
Cover them with plastic sheeting before we arrive. Sodium hypochlorite at any concentration harms fish.
Will the cleaning solution stain my driveway or sidewalk?
No. The chemistry is the same as common pool chlorine — does not stain concrete or pavers.
Cost and pricing
What does Tampa Bay house washing cost?
| House size | Typical Tampa Bay range |
|---|---|
| Small (under 2,000 sqft) | $350–$550 |
| Medium (2,000–3,500 sqft) | $400–$750 |
| Large (3,500+ sqft) | $600–$1,200+ |
| Two-story | Add ~15% |
| Three-story | Add ~35% |
What affects the price?
- Square footage
- Stories
- Siding type (stucco/Hardie cost more — more detail)
- Condition (heavy mildew = more solution + more time)
- Add-ons (gutter brightening, fascia detail, etc.)
Do you offer bundles?
Yes. The most popular Tampa Bay bundle:
- Roof + House Bundle: $899 (save $100)
- Roof: $600+
- House: $400+
- Combined: $899 same day
Do you offer payment plans?
For commercial / large residential jobs over $1,500, yes — 50% deposit, balance on completion. Standard residential is due on completion.
When to clean
What season is best?
Spring (March–May) is the most popular Tampa Bay house wash season. Cool weather, low rain, pre-summer prep, low pollen.
Fall (October–November) is the second-best season. End of growing season for mold/mildew, post-hurricane recovery if needed.
Summer works but expect afternoon rain delays.
Winter is fine — we work year-round.
My house just got painted. When can I wash it?
Wait at least 30 days. New paint needs to fully cure before any cleaning chemistry. After 30 days, normal soft wash protocols apply.
How recently does it need to have rained?
Soft wash works on damp surfaces — actually slightly better than bone dry. We can clean within 6 hours of rain, just not in active rain.
Should I wash before or after re-painting?
Before. A clean substrate makes paint adhere better and last longer. Most painters require a clean wash before they’ll quote a paint job.
Special situations
My HOA sent me a letter about my house being dirty. What now?
HOAs can require house washing under standard CC&Rs. Same approach as roof cleaning: get a professional soft wash quote, document before/after, submit to HOA.
Full HOA roof/house cleaning rules →
I’m getting ready to sell my house. Is house washing worth it?
Absolutely. A clean exterior typically adds 3–7% to perceived home value in real estate showings. A $500 house wash on a $400,000 home often returns $12,000–$28,000 in higher offers. One of the highest ROI moves before listing.
I just bought a house and it looks dirty. Should I wash now?
Yes. House washing immediately after purchase is the cleanest baseline. Get a wash + document with photos = trackable maintenance record for resale or insurance.
I have an outdoor kitchen / BBQ area / pergola. Is that included?
Usually no — outdoor structures are a separate add-on. Most outdoor kitchens need degreasing rather than soft washing. We can quote those separately.
My windows have green stuff growing in the seal. Will house washing fix that?
Yes — window seal mildew is exactly what soft wash handles. We get into the seal around frames, but we don’t squeegee or interior clean — you’ll want a window cleaner for that.
Common myths
”If I power wash my house now, I won’t need to do it again for years.”
False. Power washing removes the surface but leaves cellular foundation. Mildew returns within 3–6 months.
”My HOA can’t really make me wash my house.”
False. Florida HOAs have wide CC&R enforcement latitude. Don’t fight it — comply with a proper soft wash and document.
”I can just use bleach and a hose.”
Don’t. Concentration matters. Wrong dilution = either ineffective or damaging to plants/paint. Trained soft wash technicians blend solutions to exact specs for each surface.
”It will damage my landscaping no matter what.”
False — with proper pre/post-watering by the homeowner and careful, warranty-safe application by the contractor, plant damage is rare. Plant protection guide →
What’s the Sandbar process?
- Free instant quote in 24 hours — we walk the property, ID growth, write you an exact quote
- Pre-service prep instructions — you water plants, we send the official prep guide
- Soft wash service day — typically 3–5 hours for a standard Tampa Bay home
- Post-service walk-through — we show you results, point out anything noteworthy
- 12-month satisfaction guarantee — call us if anything looks wrong within 12 months
TL;DR
- Tampa Bay houses grow mold + mildew on shaded sides within 18 months untreated
- Wash every 12–18 months for vinyl, 12–24 for stucco
- Soft wash only — pressure washing voids siding warranty and mildew returns in 6 months
- Pre/post plant watering is the homeowner’s job — see our plant protection guide
- A professional soft wash kills mold + mildew at the cellular level for 12–24 months of clean walls
- Typical Tampa Bay cost: $350–$1,200 depending on size
- Roof + House bundle: $899 same day — most popular package
- For exact pricing: Get an instant quote →
Got more questions about Tampa Bay house washing, mold, or mildew? Text us or call (727) 712-6281.