You notice dirty windows most on the first bright morning after a long winter. The sun comes in low, and suddenly every streak, spot and haze on the glass is on display. Then there is the other kind of dirt that you only see from outside: a pale film left by months of salt spray and road dust, a ring of white dots where the sprinkler hit the glass all summer, and a fringe of grime in the tracks and along the sills.
Exterior window cleaning is more than a wipe. A proper job covers the glass, the frames, the sills, the tracks and the screens, and it is paced around the seasons we have in Minnesota. This page explains what is involved, what causes the stubborn marks, and what a good result looks like. If you want a price for your own house, get a free quote by calling or texting (651) 858-2232 or using the contact page.
What a proper exterior clean includes
A thorough exterior clean has a few parts, and it is worth checking that a provider covers all of them:
- The glass itself, washed with a cleaning solution and a squeegee, and dried at the edges so you do not get drip lines.
- Frames and sashes, wiped so the glass does not sit inside a dirty border.
- Sills and ledges, where dust, spider webs and dead insects collect.
- Screens, which hold much of the grime and pollen the window sees.
- Tracks, the channels where sliding windows and storm panels run, and where dirt packs in.
Some people want only the outside, some want inside and outside, and some want just the hard-to-reach panes. Tell us what you want when you ask for a quote. A clean should leave the glass clear from any angle, the frames free of drips and dirt, and nothing left behind on the siding or the ground.
Hard-water and mineral spotting
If your glass has white, chalky spots that do not wipe away, you are almost certainly seeing hard-water deposits. Sprinkler overspray is the usual cause. Minnesota water often carries a fair amount of dissolved minerals, and when droplets dry on glass, they leave the minerals behind. Over time the deposits can bond to the surface.
Light spotting often comes off with the right cleaning solution and some patience. Heavy, long-standing mineral buildup can etch into the glass itself, and if that has happened, it may only improve rather than disappear. The most important step for the future is to re-aim the sprinklers so they stop hitting the house. Otherwise the spots will return no matter how well the glass is cleaned.
Be skeptical of any promise that old etching will vanish entirely. A reliable provider will examine the glass, tell you what is surface deposit and what is damage, and set expectations before the work starts.
Post-winter film, pollen and lake-bug season
Winter and spring leave a distinctive residue. Salt spray from the road, exhaust film, and dust blown across thawed ground settle on glass in a pale haze that does not rinse off. A quick spray with the hose will not touch it.
Spring also brings tree pollen and the cottonwood seed that drifts across neighborhoods in early summer, sticking to wet glass and screens. Late spring and early summer in parts of the metro, especially near the river, lakes and wetlands, bring the swarms of small flying insects that people call lake bugs. They land in huge numbers, leave spotting on glass and frames, and often cluster around porch lights and entry doors.
Timing matters. Cleaning in the middle of heavy pollen or bug season can mean the windows are dirty again within a few days. For a clean that lasts, many homeowners choose a window after the worst of the pollen has passed. Others prefer a spring clean for the first light, and a fall clean before the windows are shut for winter.
Screens, tracks and sills
Screens are the part everyone forgets. They are the filter your house breathes through, and over a season they pick up pollen, dust and soot that then get pulled toward the glass and into the home. A clean window with a dirty screen still looks dingy, and it affects how much light passes through.
Cleaning a screen properly means removing it, washing both sides gently, rinsing it clean, and refitting it without bending the frame. Screens that are torn or loose should be mentioned at the quote, since cleaning will not repair them. Mesh is delicate, so a hard spray from the wrong angle can stretch or tear it.
Tracks and sills are where the leftover grime ends up. A slider with a clogged track does not close smoothly, and standing water in a sill can seep into the wall. Clearing the debris and wiping the channels dry is part of the job, and it often shows how much dirt had been building up in places you never see.
Storm windows and older windows
Many homes in older parts of Saint Paul and Minneapolis have wood-framed windows, and some still have storm windows that sit over the originals. These need a gentler hand. Old glazing putty, painted wood frames and aging seals can be damaged by too much water, so a careful, controlled method is the right call.
Storm windows often have two sides to clean, and the space between the storm and the primary window collects dust, insects and leaf debris. Some can be removed or tilted to be reached, and some cannot. If you have storms or vintage windows, tell us at the quote. If any pane is cracked, a seal looks failed (foggy between two panes), or the frame has rot, point it out, because cleaning can make those problems easier to see but will not repair them.
High, second-story and hard-to-reach glass
Many Twin Cities homes have tall entry windows, dormers, second-story panes over a deck, or glass that sits behind landscaping or over a roofline. Reaching these is a safety question as much as a cleaning question.
For high glass, providers use extension poles, ladders or other methods suited to the home. Ask any provider how they reach second-story and tall windows, how they protect your landscaping and roof surfaces while doing it, and what they will and will not do at height. If a window cannot be reached safely, a good provider says so plainly rather than doing it badly. We will look at your house and talk through access when we give you the quote.
Windows that sit above a roof, behind a porch rail, or in tight spaces between shrubs may take extra planning. Mention them at the start.
What a clean should leave behind
When the job is done, you should be able to walk around the house and check a few things:
- The glass is clear and streak-free in side light and in direct sun.
- The frames and sills are wiped and free of drips.
- The screens are clean, undamaged and back in place.
- The tracks are free of loose debris.
- The ground below is rinsed and free of dirt or water pooling against the foundation.
Glass looks different at different times of day, and some marks show only in morning or evening light. Check at more than one time, and tell us about anything that bothers you. Cleaning should not leave residue on the siding or drips on the sills, and it should not scratch the glass.
Scratches are worth a mention. Dirty glass can have grit on it, and the wrong tool can drag that grit across the pane. A careful wash rinses first and uses clean tools.
Why timing around the seasons makes a difference
Windows can be cleaned most of the year, but winter has limits. Water freezes on glass and frames, and cleaning solutions do not work well in the cold. In practice, exterior cleaning is spring through fall, and a warm, mild day in the shoulder seasons works as well as summer.
A common rhythm for homeowners looks like this: one clean in spring to remove the winter film, a second in early fall before the cold sets in, and a spot clean after a big bug event or a sprinkler mishap. Homes shaded by trees, or those beside water, collect more debris, while a sunny, open lot may do well with a single deep clean a year. If you are listing your house or hosting a big event, a clean beforehand pays off quickly.
Wind matters too. Dust and pollen stick to wet glass, so a very windy, pollen-heavy day is a poor choice, and your provider may suggest a different day.
Pairing glass with the rest of your exterior
Windows look their best after the surfaces above and around them are clean. Dirty siding drips onto fresh glass, and a rinse from the wall above can spot a window that was just finished. For that reason, house washing normally comes first and windows come second. Gutters that overflow also streak glass below, so a gutter cleaning before a window clean can save you a repeat. Driveways, patios and entries, a separate job under pressure washing, can be scheduled in the same visit.
Homeowners in Eagan, Lakeville, Woodbury and the other service areas often have large sets of windows, walkout glass and sunrooms that deserve their own plan. We can look at all of them when you call.
How to get a free quote
We start with a free quote. Call or text (651) 858-2232, or send details through the contact page. It helps to tell us roughly how many windows you have, how many stories, whether you want screens and tracks included, whether you want inside as well as outside, and whether you have storm windows, skylights, or hard-to-reach panes. Photos of any tricky areas are useful.
From there we will look at the windows, talk through the method, and confirm the exact plan with the quote.