DIY Pressure Washing Guide: Chemicals, Methods & When to Call a Professional in Pasco County, FL

🏠 DIY Pressure Washing Guide for Homeowners in Pasco County, FL

Pressure washing might seem simple—hook up a machine and spray everything clean—but there’s a lot more to it than most homeowners realize. Using the wrong pressure, chemicals, or techniques can cause serious damage to your property.

If you’re considering doing it yourself, here’s what you need to know before getting started.

⚠️ Pressure Washing vs Soft Washing — What’s the Difference?

👉 Using high pressure on roofs or siding can:

• Damage shingles

• Force water behind siding

• Void warranties

One of the biggest mistakes homeowners make is using high pressure on surfaces that require a gentler approach.

• Pressure Washing = High pressure (used for concrete, driveways, sidewalks)

• Soft Washing = Low pressure + cleaning solutions (used for roofs, siding, pool cages, etc.)

🧪 Chemicals Used in Pressure Washing

Professional exterior cleaning relies heavily on the right chemical mix—not just pressure. In fact, most of the actual cleaning comes from the chemicals, not the water pressure itself.

🧼 Common Chemical: Sodium Hypochlorite (SH)

The primary chemical used in exterior cleaning is sodium hypochlorite (SH)—commonly known as liquid chlorine or bleach.

It’s the same base chemical found in:

Household bleach (like Clorox)

Pool chlorine

However, there is a major difference in strength between store-bought products and what professionals use.

💪 Strength Differences: Professional vs Store-Bought

🏪 Store-Bought Bleach:

Typically 5%–6% sodium hypochlorite (some lower around 3%)

Found at grocery and hardware stores

Designed for light indoor use (laundry, disinfecting)

🧰 Professional-Grade SH:

Typically 10%–12.5% sodium hypochlorite

Often referred to as “pool shock” or liquid chlorine

Used by professionals for exterior cleaning

👉 That means professional SH can be at least 2x stronger than what most homeowners buy off the shelf.

🧴 Surfactants — The Secret Ingredient

Along with SH, professionals also use a surfactant.

A surfactant is a specialized cleaning additive that:

Helps the solution stick to surfaces instead of running off

Allows chemicals to penetrate deeper into algae and buildup

Improves even coverage

Helps break down dirt, grease, and organic material

Often adds a light scent to reduce bleach odor

👉 Without a surfactant, the solution can run off too quickly—especially on vertical surfaces like siding or screen enclosures—reducing effectiveness.

Don't worry, you don't need to run out and buy some commercial-grade surfactant; Gain laundry detergent works just fine. Make sure you don't overdo it, though; 0.5-1 ounces per gallon of mix is plenty.

⚖️ Typical Mix (Simplified)

A professional cleaning solution usually includes:

Water (base)

Sodium hypochlorite (cleaning agent)

Surfactant (helps it stick and work better)

• Roof Cleaning: ~3%–6% SH

• House Washing: ~1%–3% SH

• Driveways: ~2%–4% SH

• Pool Cages/Screens: ~1%–2% SH

👉 These are final application strengths, not straight chemical.

📊 Typical Strengths (After Dilution)

Proper use of sodium hypochlorite requires:

• Correct dilution ratios

• Even application

• Proper dwell time (letting it sit to work)

• Thorough rinsing

• Protection of plants and landscaping

⚠️ Important: It’s Not Just “Spray and Rinse”

It's important that whenever you're spraying sodium hypochlorite around plants, you thoroughly soak them before spraying the chemical mix and give them a good rinse after you're done. This protects the plants and landscaping.

• Typical dwell time: 5–15 minutes

• Allows SH to kill algae and mold at the root

⚠️ Important:

• Don’t rinse too early → poor results

• Don’t let it dry → can cause streaking or damage

⏱️ Why Dwell Time Matters

Once applied, the solution needs time to work.

👉 That’s why professionals rely on:

• Proper chemical strength

• Surfactants for effectiveness

• Controlled dwell time

🌴 Why This Matters in Florida

In Pasco County’s humid climate, algae and mildew grow fast and deep into surfaces. Just using water or pressure alone won’t fully remove it.

• Skipping surfactant (solution runs off too fast)

• Using straight bleach without dilution

• Applying unevenly (causing streaks)

• Letting chemicals dry on surfaces

• Not protecting plants before/after application

🚫 Common DIY Chemical Mistakes

🧠 Pro Insight

Professional pressure washing isn’t about blasting surfaces—it’s about using the right chemical mix, with the right additives, at the right strength and dwell time.

There are also other chemicals used in professional exterior cleaning—such as certain types of acids for rust, mineral, and efflorescence removal—but these can be extremely strong and require precise handling. Used incorrectly, they can permanently damage surfaces or cause injury. That’s a topic for another time, but it’s one more reason why professional experience matters.

✔ Small concrete areas
✔ Light dirt buildup
✔ You understand proper techniques

🧠 When DIY Makes Sense

You might be okay doing it yourself if:

• Roof cleaning

• Heavy algae or black streaks

• Delicate surfaces (screens, siding, stucco)

• Large areas

• Expensive pavers or decorative concrete

👉 Mistakes here can cost thousands to fix

🚨 When You Should Hire a Professional

It’s best to call a professional if you’re dealing with:

🏁 Final Thoughts

DIY pressure washing can work for small jobs, but for most homeowners in Pasco County, the risks often outweigh the savings.

Using the wrong pressure or chemicals can lead to costly damage, while professional cleaning ensures your home is cleaned safely and effectively.

If you’d rather have it done safely and professionally, we’re here to help.

Pasco County Pressure Washing
📞 (727) 355-7725
💻 pascocountypressurewashing.com

✔ Free estimates
✔ $50 off first service
✔ Serving Pasco County & surrounding areas