New Hampshire weather doesn’t hold back—between snow, rain, wind, pollen, and algae, your home’s exterior takes a beating. If your vinyl siding has gone from bright and crisp to a dull greenish-gray, it’s probably due for a solid cleaning. The good news? Vinyl siding is one of the easiest materials to freshen up—if you know the right way to tackle it.
Here’s a step-by-step guide from the pros at Conde Roofing & Construction to help you restore your home’s curb appeal without damaging your siding in the process.
Why You Need to Clean Vinyl Siding
Vinyl siding might be low maintenance, but it’s not no maintenance. Here’s why an annual cleaning matters:
- Prevents mold, algae, and mildew buildup
- Protects the finish from permanent stains
- Preserves your home’s value and curb appeal
- Extends the life of the siding
- Prepares the surface for any repairs or repainting
Bird droppings, tree sap, pollen, road dust, and even lawn chemicals can all contribute to grime, discoloration, and deterioration over time.
When to Clean Vinyl Siding in New Hampshire
The best time to wash your siding is spring or early summer, once the snow has melted and before the intense heat of July and August. That said, any dry, overcast day with mild temps will do just fine.
Tools & Products You’ll Need
Depending on your preferred method, gather one of the following:
- A garden hose with spray nozzle
- A soft-bristle brush or microfiber cloth
- A vinyl-safe house washing solution or a DIY mix of:
- 70% water / 30% white vinegar (for mold & mildew)
- A bucket of warm water + dish soap (for general grime)
For two-story homes or hard-to-reach areas, consider using a spray bottle cleaner that attaches to your hose (like Wet & Forget or Scotts Outdoor Cleaner), or hire a professional with the proper equipment.
Can You Use a Pressure Washer?
Yes—with caution.
If you’re comfortable with a pressure washer, you can use one on vinyl siding, but aim the stream straight at eye level—not upward—to avoid forcing water behind the panels, which can lead to mold and rot.
Pro tip from the Vinyl Siding Institute: Avoid pressure washers near vents, windows, electrical outlets, and door frames. Always read your siding manufacturer’s guidelines first.
Step-by-Step: How to Clean Vinyl Siding Without Damaging It
- Prep the area
- Move outdoor furniture and cover plants with tarps
- Wet the ground and landscaping to reduce chemical absorption
- Start at the bottom
- Always clean from the bottom up to avoid streaks
- Rinse from the top down so suds don’t dry in place
- Work in sections
- Spray cleaner or apply your DIY mix
- Let it sit for 5–10 minutes (but not dry)
- Gently scrub with a soft brush for stubborn spots
- Rinse thoroughly before moving to the next section
- Spot-treat stains
- Use Fantastik®, Murphy Oil Soap®, or Windex® on:
- Rust, crayon, tar, grease, and mildew
- Avoid using harsh chemicals like paint thinner or undiluted bleach, which can discolor or weaken your siding.
- Use Fantastik®, Murphy Oil Soap®, or Windex® on:
What to Avoid
- Harsh scrubbing with stiff brushes or abrasive pads
- Using a pressure washer without proper technique
- Letting soap or cleaner dry on the surface
- Ignoring shaded or damp areas—mold loves those!
How Often Should You Clean Your Siding?
Most homes need a good vinyl siding wash once a year, but shady areas or coastal properties may need attention more often. If you spot algae, streaks, or grime creeping back earlier, it’s time for a refresh.
Need Siding Repair in NH? We’ve Got You Covered.
If you’re noticing cracking, warping, loose panels, or repeated mold issues—it may be time for an inspection. That’s where we come in.
At Conde Roofing & Construction LLC, we don’t just know vinyl—we install it, repair it, and replace it. When you need to replace damaged siding, or upgrade to new energy-efficient materials, we’re your trusted local pros.
- Siding repairs
- Full vinyl siding replacement
- New siding installation for remodels and new builds
- Free, honest estimates on site
Call us at (603) 838-ROOF or request your free estimate online to get started.
