How To Clean Glass Greenhouse Glazing

Have you decided on glass as your greenhouse glazing of choice? If you understand how greenhouses work, then you know that maximizing the amount of sunlight that passes through the glass and reaches your plants is a top concern. While there are many different “special” treatments that can be incorporated into the glass during the manufacturing process to increase light transmission efficiency – there is no single thing you can do to ensure your greenhouse glazing is operating to it’s maximum potential as simply cleaning it.

Both sides of your glass should be cleaned when you have the time. The outside of the glass can become dirty with mud or dirt. The inside of your glazing may become dirty with dirt as well (from perhaps some spirited planting) but also perhaps algae might start to form on the inside of the glass due to the high humidity inside your greenhouse. In this case the cleaning serves a purpose beyond ensuring efficient light transmission – it disinfects your greenhouse, which will aid in preventing plant disease or pest infestation.

As with anything there are probably a thousand different ways to clean your glass greenhouse glazing, and I’m sure that everyone has their own special process. We’ve even heard of people using vinegar and newspaper! If you have a preferred process or method, please comment below and share with the community here.

Our process for cleaning your greenhouse glass;

NOTE: To us it is important to use only natural, mild cleaners when cleaning a greenhouse. We prefer not to have harmful chemicals near our food supply, and highly recommend this tact for others as well. Be sure to read all of the labels on the detergents you do select to make sure you are not putting you, and others, into harms way.

Outside of Your Greenhouse Glass

  1. Take a sponge, and using warm or hot water, sponge the water onto your greenhouse glass. You may need a ladder in order to accomplish this. Please be sure that your ladder is tall enough as many DIYers have been injured falling from the top rung of an un-braced ladder. Let the glass panels soak for 5-10 minutes in order to loosen up the dirt.
  2. Now that the dirt is loosened, add some mild detergent to some warm water, and using your sponge, scrub the glass. In order to remove more stubborn dirt you may need something that offers you more scrubbing power. We’ve heard people have used toothbrushes. Whatever you decide to use, be careful it is something that will not scratch your glazing.
  3. Allow the glass to air dry.
  4. Using a natural glass polisher, polish each glass pane by hand. When you need to dry the glazing you can use a dry cloth rag, or if in a pinch paper towels will also work.

Inside of Your Greenhouse Glass

  1. For safety sake, water and electricity do not go well together. It’s a good idea to disconnect your greenhouse’s power supply while cleaning the inside to avoid being shocked. Or at least cover any outlets that may get wet.
  2. In a bucket mix together some warm water and mild detergent. You should also add some disinfectant to kill any fungus and mold and to inhibit future growth.
  3. Allow the glass to air dry.
  4. Using a natural glass polisher, polish each glass pane by hand. When you need to dry the glazing you can use a dry cloth rag, or if in a pinch paper towels will also work.

If you are going to be washing the inside of your greenhouse during the cold weather months you need to be careful! The temperature difference of putting the warm water onto the cold glass could cause the glass to crack.

The following are affiliate links in case you’d like to buy some cleaner. Additionally you can look through our store.

Suggested Greenhouse Glazing Cleaning Materials

As you can see keeping your glass greenhouse glazing clean is an important maintenance activity for your greenhouse efficiency and satisfaction.

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