How to Clean a Greenhouse

Updated February 21, 2017

A greenhouse is an excellent addition to any garden. Building a greenhouse will allow you to grow plants year-round and keep specific plants out of the cold weather, which will increase their longevity. A greenhouse will also make it possible to grow food crops inside, meaning you will have access to fresh organic food more frequently. However, greenhouses need to be kept clean. The warm, moist interior of a greenhouse is an excellent place for mould and mildew to begin growing. It is important to clean your greenhouse to keep it from housing pathogens and allergy-causing mould and mildew. Thoroughly cleaning your greenhouse in the spring and fall will help you maintain the quality of the building.

Move all pots, planters and movable tables outside. Fill your buckets with warm water, soap and garden disinfectant. Wash and disinfect the outsides of pots and planters. Disinfect the insides of pots and planters before you put dirt and plants into them.

Check the greenhouse for any broken glass or structural issues that will need to be repaired. Use cloths or towels to wash the insides of the windows with warm water, soap and a garden disinfectant.

Use a scrub brush to clean dirt, mould and algae from bars and overlapping panes. Spray the insides of the windows with the pressure washer and clean water. Spray the outside of the greenhouse using the pressure washer as well.

Wash any gravel on the staging with the pressure washer. Sweep any dirt, plants and other debris off of the floor and then mop it using warm water, soap and the garden disinfectant. Hose the floor when you are done.

Return tables, pots and planters to the greenhouse.


It can also be helpful to fumigate your greenhouse with a sulphur candle or smoke cone after you have cleaned it. Follow all directions on candles or smoke cones for fumigation.

Things You'll Need

  • Pressure washing hose
  • Buckets
  • Soap
  • Garden disinfectant
  • Cloths or towels
  • Broom
  • Mop
  • Scrub brush
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About the Author

Bailey Shoemaker Richards is a writer from Ohio. She has contributed to numerous online and print publications, including "The North Central Review." Shoemaker Richards also edits for several independent literary journals and the Pink Fish Press publishing company. She holds a Bachelor of Arts in creative writing from Ohio University.