Double hung windows are popular with many homeowners for their classic aesthetic and ease of use. But they can quickly accumulate dirt and grime on the frame and glass surfaces if not maintained regularly. Sometimes mold can even begin to grow in hidden corners and crevices, which may need professional mold cleaning services. This is especially true if you haven’t opened your windows for a long time during wintertime.
How Do Double Hung Windows Work?
Double hung windows comprise two movable sashes or panels that slide up and down within a single frame. This type of window allows you to open the top and bottom independently or both at the same time. You can also tilt them inside for easy cleaning of the exterior part.
Compared to a single hung window, they provide greater airflow control, are more energy efficiency, and have more natural lighting due to their wider opening sizes. Additionally, their vertical design requires less wall space, which benefits smaller rooms.
Modern designs are typically constructed with vinyl or aluminum frames in various styles and finishes to match your home’s decor.
Tools and Steps in Cleaning Double Hung Windows
For proper cleaning, you will need the following tools and accessories:
- Soft sponge or cloth
- Cleaning solution (like mild soap or vinegar-based solution)
- Magic eraser for vinyl windows (optional)
- Wood polish for wood windows (optional)
- Window squeegee (optional)
- Extra towels
- A bucket of warm water
- Old toothbrush
- Ladder (if windows are too high to reach)
Step 1: Prepare the Window
Caution: Before proceeding, you must remove all screens from the frame to avoid tearing or damaging them.
- Unlock and raise the lower window sash a few inches to clean the bottom sill. This is recommended since the window sill is the dirtiest part, especially if you have a window screen. Note that dirt, dust, and pollen can easily get trapped there.
- Use a vacuum or sponge and soapy water to remove the debris.
Tip: While cleaning, examine each window to see if repairs are necessary. See if there is mold growth, broken glass, or if some parts are worn out.
Step 2: Clean the Interior Window
You can choose to clean the interior or exterior first, as there is no rule of thumb. But if your windows are filthy, starting with the inside is better. However, it’s always recommended to clean the upper sash first than the lower one to avoid drips.
- Remove the grilles if you have them.
- Start wiping down all the surfaces with a damp cloth or sponge and a cleaning solution or standard cleaner like Windex. Usually, the inside part of the window is not as dirty as the outside, so the process shouldn’t take long.
Tip: Avoid using ammonia- or alcohol-based glass cleaners, as they may leave a streak or produce a film that can attract moisture or dust. To make a safer solution, mix one cup of white vinegar with 10 cups of clean water and pour the solution into a spray bottle.
Step 3: Clean the Exterior Window
As mentioned, one of the benefits of these types of windows over single hung windows is that you can clean their exterior from the inside of your home. This helps when the windows are too high to reach from the outside and you need to use a ladder.
- To start, raise the bottom sash and locate the tilt hatches. These small hatches at the top corners of the lower sash allow you to tilt the window inward easily for cleaning.
- Gently push on them and hold into the lower sash as it tilts toward you. The window should be at an almost 90-degree angle (flat) to the wall, letting you access the outer part easily. Avoid tilting your window too far, as this could damage the frame.
- Begin cleaning the glass with a cloth and cleaning solution. Since the exterior part is dirtier than the inside, it may take longer to finish.
Tip: If you want a spot-free window, invest in a squeegee, which is not that expensive. However, you must often replace the blade to maintain a clean sweep.
Step 4: Clean the Track and Frame
After wiping down the exterior:
- Move to the track and frame. You can use a damp cloth or sponge with warm, soapy water.
- Start cleaning all the dirt and debris from the track with an old toothbrush.
- Don’t leave any obstructions in the way of closing it to ensure a proper seal when you close your windows.
- Next, wipe down the frames with your cleaning solution and let them dry completely. You may apply wood polish or a magic eraser for vinyl windows.
- This is optional, but you may apply window lubrication to your tracks for easier sliding motion. This helps prevent squeaking sounds and rust buildup caused by moisture accumulation on the metal parts.
Tip: Stay away from abrasive chemical solutions that can discolor the frame finish of your windows.
Step 5: Clean the Window Screen
Before returning the screens to the window frame and finish your task:
- Clean them by scrubbing the accumulated dust and dirt with an old toothbrush or any soft-bristled brush and soapy water.
- Use a sponge, mild detergent, and warm water for grease spots (usually found in kitchen window screens).
- Then rinse each screen with clear water and allow it to dry before returning so the water won’t drip into the wall or window.
Tip: It’s best to clean your double hung window on a mild, dry day so that it will be easier for them and the screens to dry naturally before putting them back into their original placement.
How Mold Can grow on Double Hung Windows
Mold can quickly develop in double hung windows, especially if they are not properly maintained and cleaned regularly. The combination of humidity, organic materials like dust or pollen, and leaking rain on the outside can create ideal conditions for mold growth. Since these types of windows are often located in higher parts of the house, condensation can also form on the glass panes due to differences in outside and indoor air temperatures.
This moisture buildup can develop mold colonies around your window frames and sills with time. Ensure that you inspect all components of your windows throughout the year to detect any signs of mold before it becomes a bigger problem.
What Happens if Mold Is Left Unattended?
Over time, neglected mold can cause serious damage to the structure of your windows and their components. This can include warping, rotting, or rusting in some cases. Mold growth also increases the chances of water infiltration through your window frame, leading to costly repairs down the line.
Furthermore, if left untreated for a long time, mold can spread to other parts of your home as airborne spores. This could lead to health problems like allergies or severe issues like asthma attacks. You might need to hire a professional if there is a severe mold infestation. This ensures the mold is completely removed and no new colonies form afterward.
Key Takeaways
Having clean windows is essential for a healthy home, and double hung makes it easy. Make sure to clean their interior and exterior regularly to prevent any dirt buildup or mold formation. Remember to clean the top sash first to prevent drips. It’s also important to make an inspection throughout the year for any signs of physical damage so you can take corrective measures before they become more serious. Most importantly, if you encounter a severe mold infestation, consider hiring a professional for help.
