Ask Everett homeowners how they keep their solar panels clean, and a common answer is “the rain takes care of it.” It is an easy assumption to make. Everett sees plenty of rain, and panels sit out in it for months at a time. But rain and clean are not the same thing. If your system’s output seems lower than it should be, a solar panel cleaning service in Everett may find more on your panels after the wet season than you would expect.
Why Rain Doesn’t Actually Clean Solar Panels?
Rain is a rinse, not a wash. On the way down, it picks up particles from the air, such as dust, pollen, and soot, and carries them onto your panels. When the water evaporates, those particles stay behind as a thin film.
Light rain is often the least helpful. A drizzle wets the dirt just enough to spread it around, but not enough to carry it away. After a week of on-and-off showers, panels can end up looking hazier than they did before the rain started.
Rain also has no scrubbing action. Anything sticky or dried on, like bird droppings or tree sap, stays right where it is.
Then there is drainage. Water runs down the panel and collects along the bottom edge, where the glass meets the frame. As it dries, it leaves dirt behind in that same spot over and over. Panels mounted at a low tilt drain more slowly, which gives grime even more time to settle.
What Everett’s Wet Season Leaves on Your Panels
After a long stretch of gray, wet weather, here is what typically builds up.
A thin film of residue
The haze left behind by evaporating rain is easy to miss from the ground. Up close, it dulls the glass and scatters some of the light that should be reaching the cells.
Grime lines along the lower edge
A band of dirt along the bottom of each panel is one of the most common things a cleaning removes. It builds slowly, one rain at a time, and it doesn’t wash away on its own.
Needles, leaves, and pollen
Everett neighborhoods with mature firs, cedars, and maples see steady debris through fall and winter. Needles get caught along panel frames and in the gaps between panels, and wet leaves can sit flat on the glass for days.
Moss, algae, and lichen
Damp, shaded surfaces are perfect for green growth. Moss can spread from nearby roof areas and creep along the edges of the panels, where moisture lingers the longest.
Bird droppings
Droppings dry hard, block light completely where they land, and rain does little to break them down. Panels near a favorite perch or roofline tend to collect them over and over.
Why Dirty Panels Matter More in Winter?
In winter, days are short, the sun sits low, and clear stretches are limited. Each hour of usable light counts for more, so anything blocking that light costs you more of the little production you get.
Dirt blocks light all year round. The difference in winter is that there is less margin. A layer of grime that you might not notice in July can take a bigger bite out of an already modest December output.
If you have seen production drop even on bright days, our earlier post on why solar production drops on clear days covers more of the causes.
How to Tell If Your Panels Need Cleaning?
You don’t need to climb onto the roof to find out. Try these instead:
- Check your monitoring app. Compare production on days with similar weather a few weeks apart. A slow, steady decline is a common sign of buildup.
- Look from an upstairs window or the yard. Watch for haze, a dark line along the bottom edges, or patches of green.
- Spot obvious debris. Leaves, needles, or bird droppings visible from the ground usually mean there is more you can’t see.
- Think about the last cleaning. If your panels haven’t been professionally cleaned in over a year, they are likely due.
Please stay off the roof. Wet panels and mossy shingles are slippery, and it isn’t worth the risk.
What a Solar Panel Cleaning Service in Everett Includes?
Rusty’s solar panel cleaning is designed to remove what the rain leaves behind without harming the panels. Each service includes:
- Safe and thorough cleaning of the panels and surrounding areas
- Removal of dirt, dust, leaves, and other debris that block sunlight
- Eco-friendly, non-abrasive cleaning agents and methods
- Inspection for visible damage or debris buildup
- Professional tools and techniques that protect your panels
- Attention to detail so there are no streaks or smudges
Most cleanings take about 1 to 2 hours, depending on the number of panels and their condition. If moss is spreading onto your panels from the roof, combining solar cleaning with roof cleaning or gutter cleaning helps deal with the source.
When to Schedule Cleaning in Everett?
Most homes do well with a cleaning once or twice a year. Properties close to trees, or in areas with heavy pollen or dust, may need it more often.
Two windows work well locally. Late winter or early spring clears away everything the wet season left behind before the long days of spring and summer. Early fall clears off summer dust and pollen before days get short and every hour of light matters more.
Frequently Asked Questions
Doesn’t rain clean my solar panels?
Rain rinses away some loose dust, but it also leaves a film as it dries and pushes dirt down to the lower edge of each panel. It doesn’t remove bird droppings, sap, or moss.
How often should solar panels be cleaned in Everett?
At least once or twice a year for most homes. Homes near trees or in dusty or high-pollen areas may need more frequent cleaning.
Can I clean my solar panels myself?
Check your panel manufacturer’s care instructions first. Avoid climbing onto the roof, using pressure washers, or using abrasive tools and harsh chemicals. For anything beyond a look from the ground, a professional is the safer option.
Will cleaning fix low solar production?
Cleaning removes buildup that blocks sunlight, which is a common cause of reduced output. It won’t fix equipment problems or shading from trees. If production stays low after a cleaning, contact your installer.
How long does a solar panel cleaning take?
Most cleanings take about 1 to 2 hours, depending on the number of panels and their condition.
Schedule Solar Panel Cleaning in Everett
Rusty’s Window Cleaning is a family-owned, licensed, and insured company based in Lake Stevens, with more than 10 years of experience serving Everett and the Greater Puget Sound. If your panels are carrying the wet season around with them, call us at 425-374-1603 or request a free quote. Learn more about our solar panel cleaning service, or find us at 11708 2nd St SE, Lake Stevens, WA 98258.