Metal siding is known for its durability and low maintenance, making it a popular choice for homeowners. However, even the toughest exterior materials require occasional cleaning to maintain their appearance and performance.
Knowing how to clean metal siding properly — without damaging the finish — is essential. Below is a practical guide that covers everything from routine washing to removing stubborn stains.
Why Regular Cleaning Is Important for Metal Siding
Routine cleaning helps preserve the protective coating on metal siding, extending its lifespan and maintaining its shine.
Regular maintenance also supports energy efficiency. Dirt buildup can absorb heat, causing your home to retain more warmth during the summer months — which may increase cooling costs.
Keeping gutters clean can prevent dirty runoff from staining siding. Professional siding services and gutter services help protect your entire exterior system.
Inspect Metal Siding Before Cleaning
Before cleaning metal siding, inspect it carefully.
Look for:
- Dents or storm damage
- Scratches exposing bare metal
- Rust spots
- Loose panels
Any exposed steel should be addressed promptly to prevent corrosion. If you notice damage, consider scheduling a professional inspection before proceeding.
How to Clean Metal Siding for Everyday Dirt and Grime
For routine maintenance, a simple wash is usually sufficient.
Plan to clean metal siding twice per year — ideally in spring and fall.
Step 1: Pre-Rinse the Metal Siding
Use a garden hose to rinse from top to bottom. This removes loose debris and prevents scratching during scrubbing.
Step 2: Wash the Metal Siding With Mild Detergent
Mix:
- 1/3 cup mild detergent (dish or laundry soap)
- 6 gallons of water
Use a soft nylon brush on an extension pole to gently scrub the siding. Focus on areas where dirt tends to accumulate.
Step 3: Rinse the Metal Siding Thoroughly
Rinse from top to bottom to prevent streaking. Do not allow soap to dry on the surface.
Step 4: Final Inspection After Cleaning Metal Siding
Once dry, check for missed spots and repeat as needed.
For larger surfaces, a pressure washer on its lowest setting may help — but use caution.
Can You Pressure Wash Metal Siding Safely?
Pressure washing can clean metal siding quickly, but improper use can cause damage.
High pressure can:
- Dent metal panels
- Strip protective coatings
- Force water behind siding
- Damage seals around windows and trim
If using a pressure washer:
- Choose a low-pressure setting
- Keep the nozzle 3–4 feet away
- Test on a small, inconspicuous area first
- Avoid spraying upward
Soft washing is generally safer than high-pressure washing.
Be especially cautious around replacement windows and doors to prevent water intrusion.
How to Remove Tough Stains from Metal Siding
Sometimes standard washing isn’t enough. Here’s how to handle common stains on metal siding.
How to Remove Mildew or Mold from Metal Siding
Mix equal parts white vinegar and water. For severe cases, use diluted bleach carefully and avoid overspray on landscaping.
Always wear gloves and follow manufacturer instructions.
How to Remove Rust from Metal Siding
Use a commercial rust remover or a light application of WD-40. If rust appears frequently, identify and fix the underlying cause.
How to Remove Grease or Oil from Metal Siding
Apply a degreaser directly to the affected area and rinse thoroughly.
How to Remove Chalky Residue from Metal Siding
Use a siding restoration product or automotive wax to restore shine.
Avoid leaving strong cleaners on the surface too long, as they may cause corrosion or finish damage.
How Regular Cleaning Protects Your Metal Siding Investment
Properly cleaning metal siding:
- Improves curb appeal
- Prevents premature deterioration
- Protects factory coatings
- Extends lifespan
Exterior maintenance often complements other improvements like roof repairs or roof replacement.
Maintaining your entire exterior system ensures long-term protection.
Professional Metal Siding Cleaning and Exterior Services by RAM Exteriors
If your metal siding requires deep cleaning, repair, or replacement, professional expertise ensures the job is done safely and correctly.
RAM Exteriors — Serving Bucks County, Montgomery County & Surrounding Communities — provides expert siding services, roofing repairs, gutter maintenance, window installation, and complete exterior solutions designed to protect and enhance your home.
Contact RAM Exteriors today to schedule professional exterior service and keep your metal siding looking its best year-round.