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How often should you clean the windows in your home?
Updated October 19, 2026
For most homes, a full clean of both sides about twice a year, in spring and fall, is enough. Inside glass gets cleaned when it looks dirty, which This Old House describes as typically monthly. High-touch glass such as sliding doors may need a quick clean every week, especially with pets or children. Homes near the coast or in dusty, industrial or agricultural areas need more: Andersen recommends cleaning glass at least every three months there.
A schedule by type of glass
| Glass | How often | Notes |
|---|---|---|
| Sliding and patio doors, low glass | Weekly or as needed | Spot clean the marked area; a full clean less often |
| Main view windows, inside | About monthly | More often if you notice film from cooking or heating |
| All windows, inside and outside | Twice a year | Spring and fall for most homes |
| Exterior glass in coastal, industrial or agricultural areas | At least every three months | Salt, dust and spray build up faster |
| Screens | With each full clean | Dirty screens make clean glass look dull |
| Sliding door tracks | Clean when gritty; lubricate every few months | Milgard suggests a silicone-based lubricant every few months or when the door sticks |
Swipe the table sideways to see every column.
Sources: This Old House for the general and interior guidance, Andersen for coastal and agricultural areas, and Milgard for tracks. Consumer Reports gives a similar baseline of twice a year for inside glass.
What makes you need it more often
- The coast. Salt spray builds up quickly, This Old House notes.
- Trees and pollen. Windows near a lot of trees get pollen, sap and leaves. Many people time a full clean for after the heaviest pollen season, so the glass doesn't need doing twice.
- Pets and children. This Old House suggests weekly interior cleaning where pets or children touch the glass regularly.
- Smog, construction or dust. This Old House suggests up to three exterior cleans a year in high-pollution areas.
- Humidity. Damp climates can mean more frequent cleaning to keep mold and mildew off frames and glass.
- Sprinklers. Water hitting the glass leaves mineral spots, which get harder to remove the longer they stay.
Signs it's time
- The view looks hazy when the sun is low.
- You can see handprints or nose prints from across the room.
- Rain leaves visible spots or streaks after it dries.
- Screens look grey, or the sill and track feel gritty.
- A sliding door starts to drag or squeak.
Why regular light cleaning beats occasional heavy cleaning
Glass that gets cleaned regularly needs less product and less effort each time. Glass that's left too long can collect deposits that ordinary cleaners can't lift. Vitro warns that runoff left on glass can cause permanent staining or damage if it isn't removed promptly. A short, frequent routine on the glass that gets dirty fastest is easier than a big recovery job once a year.
If your glass still looks dirty after you clean it, the problem may be something other than frequency. See why windows still look dirty after cleaning.
A year at a glance
| When | What |
|---|---|
| Spring, after the heaviest pollen | Full clean inside and out, screens, frames and tracks |
| Every month | Inside of main view windows |
| Every week or as needed | Spot clean sliders and low glass |
| Every three months (coastal or dusty areas) | Exterior glass |
| Fall, before the weather turns | Full clean inside and out, screens, frames and tracks |
Who does what
Frequency is easier to keep up when the work is split sensibly. A common setup is a professional for the twice-yearly exterior clean of glass you can't reach safely, and your own routine cleaning in between. Our guide to professional vs DIY window cleaning compares the options. For the weekly and monthly work on large, smooth glass, an automated window cleaning system such as the Window Washing Robot can take over the routine passes while you stay nearby.
Frequently asked questions
How often should windows be cleaned?
Most homes need a full clean of both sides about twice a year, usually spring and fall. Clean inside glass when it looks dirty, often about monthly, and spot clean high-touch glass like sliding doors weekly or as needed.
How often should you clean windows near the coast?
More often than inland homes. Andersen recommends cleaning glass at least every three months in coastal, industrial or agricultural areas, because salt and dust build up faster.
How often should I clean the inside of my windows?
When they look dirty, which This Old House describes as typically monthly. With pets or children who touch the glass, weekly interior cleaning of the affected panes is reasonable.
What is the best time of year to clean windows?
Spring and fall are the usual times for a full clean. In areas with heavy pollen, many people wait until after the peak pollen season. Whatever the season, clean on a cloudy day or in shade, so cleaner doesn't dry on the glass.
How often should I clean my sliding door track?
Clean it when it feels gritty or the door starts to drag. Milgard suggests lubricating the track with a silicone-based lubricant every few months or whenever the door sticks.
Twice a year for a full clean, monthly for the inside of the glass you look through, and weekly for the doors everyone touches covers most homes. Add more if you're near the coast, have pets or children, or live with heavy pollen or dust, and deal with mineral spots before they set.
Related guides
Sources
- This Old House, How Often Should Windows Be Cleaned? (updated June 2026)
- Andersen Windows, cleaning glass and frame surfaces
- Consumer Reports, Take the Pain Out of Window Cleaning
- Milgard, How to clean and lubricate a sliding patio door track
- Vitro Architectural Glass, Clarity on Proper Glass Cleaning