How to Clean Greenhouse Plastic Sheeting?

How to Clean Greenhouse Plastic Sheeting for Maximum Light and Durability?

Greenhouse plastic sheeting, also called polyethylene film or plastic glazing, is a cost-effective covering used in many agricultural greenhouses. However, like any other outdoor surface, it collects dirt, algae, mildew, and mineral deposits over time, especially in humid or dusty environments.

Keeping your greenhouse plastic clean is essential for two major reasons:

1. Light Transmission: Even a thin layer of dust or algae can reduce light penetration by 10–30%, which directly affects crop growth.

2. Material Longevity: Proper cleaning can prevent premature degradation and cracking, saving you money on frequent replacements.

So, how do you clean greenhouse plastic sheeting the right way? Let’s walk through it step-by-step.

Why Clean Your Greenhouse Plastic?

Before diving into the process, it's important to understand the benefits of regular cleaning:

• Improved Crop Yield: More light = better photosynthesis.

• Longer Material Lifespan: Remove corrosive dirt and algae.

• Better Climate Control: Less insulation resistance caused by buildup.

• Enhanced Professional Appearance: Especially important for visitor-facing greenhouses.

What You’ll Need

Here are the tools and supplies required to safely clean greenhouse plastic:

Basic Equipment:

• Soft-bristle broom or sponge mop with extension handle

• Garden hose with spray nozzle

• Bucket

• Microfiber cloths

• Safety goggles and gloves

Cleaning Solutions (Choose One):

• Mild soap solution (dish soap + warm water)

• White vinegar solution (1 part vinegar to 3 parts water)

• Commercial greenhouse-safe plastic cleaner

• Hydrogen peroxide (for algae and mold)

Tip: Never use abrasive cleaners, bleach, or ammonia-based products. These can degrade the UV coating and reduce film durability.

Step-by-Step: How to Clean Greenhouse Plastic Sheeting

✅ Step 1: Plan the Timing

Clean the plastic on a dry, calm, and cloudy day to avoid rapid drying or wind interference. Late morning is usually ideal.

✅ Step 2: Remove Loose Debris

Use a broom or blower to remove leaves, twigs, and dust from the exterior. Don’t press too hard—avoid scratching.

✅ Step 3: Rinse with Water

Use a hose to rinse the surface thoroughly. A medium-pressure nozzle works well—avoid high pressure washers as they can tear the film.

✅ Step 4: Apply Cleaning Solution

Dip your sponge mop or soft cloth in your chosen cleaning solution and gently scrub the surface in circular motions. Start from the top and work your way down.

For interior surfaces, make sure all electricals are off or sealed before applying water.

✅ Step 5: Rinse Again

Thoroughly rinse off all cleaning agents. Leftover soap can attract more dust.

✅ Step 6: Dry or Air Dry

Wipe dry with microfiber cloths or allow the sheeting to air dry. Do not use heat dryers or expose to direct sun immediately.

Common Mistakes to Avoid

• Using Abrasive Tools: Wire brushes, scrapers, or rough pads will scratch the plastic.

• Cleaning in Direct Sunlight: This can cause streaking or quick drying before rinsing.

• Neglecting the Inside: Interior plastic also gets dirty from condensation and pests.

• Not Testing Solutions First: Always spot test to prevent damage.

How Often Should You Clean Your Greenhouse Plastic?

• Exterior Cleaning: 1–2 times per year, ideally in spring and fall.

• Interior Cleaning: Once a year during a low-growth period or during crop rotation downtime.

• Spot Cleaning: As needed—especially after storms or heavy dust.

  
  

For areas with high humidity or frequent rain, consider cleaning more often to remove algae or mineral stains.

Should You Disinfect the Plastic?

Yes, especially for commercial growers. Disinfection helps prevent the spread of diseases and pests. After washing, use a diluted hydrogen peroxide solution or a greenhouse-safe disinfectant to wipe down the inside surfaces.

Safety Tips During Cleaning

• Wear gloves, goggles, and non-slip shoes.

• Use ladders or platforms safely—never stretch or lean on the plastic.

• Turn off greenhouse electrical systems if water is involved inside.

Long-Term Maintenance Tips

To keep your greenhouse plastic clean longer:

• Install gutters and overhangs to reduce splash dirt.

• Trim nearby trees to avoid falling debris or sap.

• Use anti-condensate coatings to reduce interior mildew buildup.

• Apply UV-protective films to slow degradation and make cleaning easier.

Final Thoughts

A clean greenhouse is a productive greenhouse. Whether you’re growing vegetables, flowers, or nursery plants, maintaining your plastic sheeting can improve light levels, crop health, and the longevity of your structure.

By following the steps above and using the right materials, greenhouse owners can ensure better performance from their investment—and fewer unexpected repair costs.