Keeping your greenhouse glass clean isn’t just about making it look nice. It actually helps your plants grow better by letting in more sunlight. Over time, dirt, algae, and grime build up, blocking the light your plants need. Cleaning the glass properly makes a real difference, and if you keep up with it, it doesn’t have to be a massive chore.
Choosing the Right Time to Clean
You don’t want to clean your greenhouse on a hot, sunny day. The heat will dry the cleaning solution too fast, leaving streaks and making the job harder than it needs to be. A mild, cloudy day is ideal. If that’s not possible, aim for early morning or late afternoon when the sun isn’t too strong.
What You’ll Need
Before you get started, gather your supplies. Here’s what works best:
- A bucket of warm, soapy water (mild detergent or a dedicated greenhouse cleaner)
- A soft sponge or cloth
- A squeegee for streak-free results
- A soft-bristled brush for stubborn dirt
- White vinegar or a mix of water and baking soda for tougher stains
- A garden hose or a watering can with clean water for rinsing
- Rubber gloves if you have sensitive skin
Avoid using anything too abrasive, like wire brushes or rough sponges, as these can scratch the glass and make it easier for dirt to build up in the future.
Cleaning the Outside of the Greenhouse
Start by giving the glass a good rinse with a hose or a bucket of water. This removes loose dirt and stops you from just smearing it around when you start scrubbing. Next, dip your sponge or cloth into the soapy water and wipe down the glass in circular motions. If you notice any tough spots, use your soft-bristled brush or apply a bit of white vinegar to break down the grime.
Once you’ve cleaned all the glass panels, rinse everything thoroughly with clean water. You don’t want any soap residue left behind, as it can attract more dirt. Use a squeegee to remove excess water, helping to prevent streaks. If you don’t have a squeegee, a dry, lint-free cloth will do the job.
Cleaning the Inside of the Greenhouse
The inside of the glass can get just as dirty as the outside, especially with condensation and algae buildup. You’ll need to be a bit more careful here since you don’t want dirty water dripping onto your plants.
Move any pots or trays away from the glass before you start. Use the same cleaning method as outside wipe down with soapy water, scrub stubborn areas, and rinse thoroughly. If you have any ventilation windows, give those a good clean too, as dust and grime tend to collect around the edges.
Dealing with Algae and Mould
If you spot green or black patches, that’s likely algae or mould. These love damp conditions and can spread quickly if left unchecked. White vinegar works well for removing algae, while a mix of water and baking soda can tackle mould. Apply either solution with a cloth or sponge, scrub gently, then rinse off.
To help prevent algae from coming back, make sure your greenhouse is well-ventilated. Keeping the interior dry reduces the chance of mould and algae taking hold.
Cleaning the Frame
The glass isn’t the only part that gets dirty. The greenhouse frame, whether it’s wood, metal, or plastic, also needs attention. Wipe it down with soapy water and a sponge, making sure to get into the corners where dirt collects. If you notice any rust on a metal frame, use a rust remover or fine sandpaper to clean it up before it spreads.
Regular Maintenance
You don’t have to deep clean your greenhouse every week, but regular upkeep makes the job much easier. A quick wipe-down every few weeks helps keep algae and dirt from building up. Checking after heavy rain or storms is also a good idea, as splattered mud and debris can stick to the glass.
What to Avoid
It’s tempting to use pressure washers, but they can be too strong and may damage seals or force water into joints where it shouldn’t go. Harsh chemicals like bleach can also be a bad idea, as they might harm your plants or degrade the greenhouse materials over time.