Why Fall Is the Second Most Important Time to Clean Your Solar Panels

By Tim McGann, Co-Owner of Pristine Panels · Published: October 9, 2026

Spring Gets All the Attention. Fall Deserves It Too.

Most Augusta homeowners know their panels need help after spring pollen season. That yellow film is hard to miss. But by the time October rolls around, your panels have been through a long, hot summer, a second pollen season, and the heart of storm season. Most of what that leaves behind is harder to see, but it still costs you power.

That’s why we recommend cleaning twice a year: once in late spring after pollen season, and once in late summer or fall. Here’s why the fall cleaning matters just as much as the spring one.

What Summer and Fall Leave on Your Panels

A second pollen season. Pine pollen gets the headlines in spring, but ragweed takes over later in the year. Ragweed blooms from August into November, and its pollen usually peaks in mid-September. That’s right before most homeowners think about their panels again.

Storm season debris. The Atlantic hurricane season runs from June 1 to November 30 and peaks around September 10. Even when a storm doesn’t hit us directly, wind and heavy rain scatter leaves, twigs and grime across rooftops all over the CSRA.

Summer dust and bird droppings. Months of heat, dust and birds leave buildup that bakes onto the glass. Bird droppings in particular don’t rinse off easily.

Why Rain Won’t Finish the Job

It’s easy to assume a good rain washes your panels clean. Research says otherwise. An NREL-led study of solar plants in North Carolina, a climate a lot like ours, found that rain didn’t remove tree pollen from the panels. Even with regular rain “cleanings,” unwashed panels lost about 10% of their annual production, and during peak pollen seasons efficiency dropped by as much as 15%.

The same study found that cleaning panels by hand with a wet brush after rain improved performance by 5% to 11%. Rain helps, but it doesn’t do the whole job.

Small Patches Can Mean Big Losses

Anything that blocks sunlight on part of a panel matters more than you might think. NREL research on rooftop systems found that partial shading can lead to annual losses of 10% to 20% or more in residential installations. Part of the reason is how panels are wired: when one section of a panel is shaded, the panel’s built-in bypass diodes can switch that whole section off.

A clump of wet leaves or a patch of bird droppings shades only part of a panel, but it can still pull down more of your system’s output than its size would suggest.

Why Twice a Year Is the Sweet Spot

The pollen study shows rain alone leaves real power on the table, and Augusta gets two pollen seasons plus storm season every year. Two cleanings line up with how dirt actually builds up here:

Late spring cleaning: Clears the heavy pine and oak pollen so your panels start summer, their most productive season, at full output.

Late summer or fall cleaning: Clears ragweed pollen, summer dust, bird droppings and storm debris, so the buildup doesn’t sit on your panels through the winter and into next spring.

There’s a second reason, too. Solar panels now typically last 25 to 35 years, according to the U.S. Department of Energy. Two professional visits a year means two chances to catch problems early, like loose hardware or storm damage, over that long lifespan.

What’s Included in a Pristine Panels Cleaning

Every cleaning includes a purified, deionized-water wash with soft-bristle brushes and no harsh chemicals, a streak-free rinse, and a full inspection of your panels and mounting hardware. We can also provide before-and-after performance notes on request.

Frequently Asked Questions

How often should solar panels be cleaned in Augusta?

We recommend twice a year: once in late spring after pollen season, and once in late summer or fall to clear ragweed pollen, summer dust and storm debris.

I had my panels cleaned in the spring. Do I really need a fall cleaning?

Yes. Ragweed pollen peaks in mid-September, hurricane season runs through November 30, and research shows rain alone doesn’t wash tree pollen off panels. A fall cleaning removes what has built up since spring.

How much does a fall cleaning cost?

$250–500 per cleaning, depending on whether your home is one or two stories and how many panels you have. We’re happy to give you a free, exact quote.

Can I just hose off my panels myself?

You can rinse panels from the ground, but rinsing alone often leaves pollen and grime behind, and climbing on a roof is risky. We use deionized water and soft brushes, and we inspect your panels and mounting hardware while we’re up there.

Schedule Your Fall Cleaning Today

Your panels have worked hard all summer. Give them a fresh start for the months ahead and catch any storm damage early. Call Tim at (762) 320-9290 or request your free quote online.