Why Pergolas Need Annual Cleaning
A pergola sits outside 24/7, exposed to weather, leaves, and pests. Over time, mildew grows on shaded surfaces, cobwebs collect in rafters, bird droppings accumulate on horizontal beams, and dirt darkens the color of the material. Left untreated, wood pergolas rot, metal ones rust, and vinyl ones stain permanently. An annual cleaning — ideally in early spring — restores the appearance and extends the life of the structure.
What You'll Need
- Heavy-duty outdoor cleaner — Turbo Clean Degreaser cuts grime on all pergola materials.
- Long-handled scrub brush
- Extension pole — for high areas.
- Garden hose with spray nozzle
- Step ladder
- Safety glasses
- Drop cloths — to protect plants below.
Step-by-Step: How to Clean a Pergola
Step 1: Remove Loose Debris and Cobwebs
Before wetting anything, sweep off loose debris. Use a broom or long-handled brush to knock down cobwebs, dead leaves, and loose bird droppings. Pay attention to the rafters and corners where debris collects. Cover plants and furniture below with drop cloths.
Step 2: Rinse the Entire Structure
Hose down the pergola from top to bottom. Start with the rafters and work downward so dirt runs off rather than onto already-cleaned sections. Use medium pressure — avoid high-pressure washing on wood pergolas because it can splinter the grain.
Step 3: Scrub With Cleaner
Mix Turbo Clean Degreaser per label dilution in a bucket of warm water. Using the long-handled brush on an extension pole, scrub all surfaces of the pergola including the tops of beams where dirt accumulates. Work in sections. For mildew, spray a 1:1 white vinegar solution directly on the mildew, let sit for 15 minutes, then scrub and rinse.
Step 4: Rinse Thoroughly and Dry
Rinse the entire structure thoroughly from top to bottom. Check for remaining soap residue — any residue left on wood can attract dirt and accelerate buildup. Let the pergola air-dry completely. For wood pergolas, this is a good time to assess whether the stain or sealant needs to be refreshed before next year.
Pro Tips
- Clean in spring before planting. Tackle the pergola early in the season before your plants and outdoor furniture are in place. Much easier access and no risk of damaging plants below.
- Reseal wood every two to three years. Cleaning alone does not protect wood. After cleaning, let the wood dry fully and apply a fresh coat of exterior stain and sealant to prevent weathering.
- Use a pressure washer carefully on metal and vinyl. Metal and vinyl pergolas tolerate medium-pressure washing well, saving you significant scrubbing time. Wood needs gentler treatment.
FAQ
Can I use bleach on a wooden pergola?
A diluted bleach solution (1:9) can be used to kill heavy mildew on wood, but it can also discolor the wood and damage surrounding plants if runoff reaches them. Oxygen bleach (safer for wood and plants) is a better alternative.
How do I reach the top of a tall pergola?
Use a scrub brush on an extension pole for most surfaces. For anything a pole cannot reach, a sturdy step ladder with a helper holding it is safer than an extension ladder solo. Never scrub overhead while on a ladder — use a pole.
Can I clean string lights and other decor without removing them?
Unplug any lights before cleaning. A damp cloth wipes down the bulbs. Avoid spraying water directly on electrical fixtures. For heavy cleaning, take down the lights and reinstall after the pergola is dry.
How often should I clean a pergola?
A full clean once per year, ideally in spring. Quick sweeping of debris monthly during heavy use season. Spot-clean bird droppings and spills as needed.
