Common questions, honest answers

Clean panels capture more sunlight — that's the whole mechanism. For the "when," my rule of thumb is a cleaning is worth booking when your monitoring app shows a dip versus the same month last year, or when there's visible buildup on the glass. If your production is tracking last year and the glass looks clean, I'll tell you to wait.NREL Soiling Losses Report (2024)

NREL research specifically found that rainfall alone doesn't recover pollen losses — mechanical cleaning is required. For a full breakdown of eight region-specific signs tied to Wisconsin's seasonal cycle, see my When to Clean guide linked in the footer.NREL: Rain Not Enough to Wash Pollen (2023)

Qcells' own manual confirms rain usually handles loose dirt on tilted panels — the question has never been whether rain does anything, it's what rain CAN'T do. Wisconsin has no equivalent published soiling study, so your own panels are the best evidence: if you can see buildup after a rain, rain isn't removing it.Renewable Energy World: NREL Pollen Study

For most systems, not on a fixed schedule. NREL's 2024 PV Fleet report puts U.S. annual soiling losses across a wide range where dry regions and farm-adjacent sites sit at the top. Wisconsin has no published soiling study, so my rule of thumb is: clean when you can see buildup (bird droppings, pollen film, farm dust, or debris along the panel edges). If your panels look clean and production matches last year, I'll tell you to wait.Princeton: Panel Cleaning & Air Quality (2021)

I tried the hose on my own panels before starting Solar Alchemist, so I'll answer honestly: it's cheap, it feels productive, and it leaves mineral streaks. Southern Wisconsin tap water runs about 18–22 grains per gallon, so the calcium and magnesium dry into a film that reduces light transmission. Rooftop work also has real fall-risk. My deionized-water system leaves zero mineral content, and a soft rotary brush matched to your panel manufacturer is engineered for solar glass coatings — that's what changed my mind, and it's what I use on every job.Madison Metropolitan Sewerage District: Water Hardness

Homeowners' policies generally exclude losses caused by neglect or lack of maintenance, and cleaning is considered routine maintenance. A simple paper trail of professional cleanings — with timestamped before-and-after photos — makes it easier to demonstrate you kept up with recommended care. Always confirm what your specific policy requires with your agent. See my Warranty Protection page for the full breakdown.Insurance Information Institute: HO-3 Homeowners Sample Policy (PDF)

Natural panel degradation averages about 0.5% per year according to NREL's review of over 1,900 systems, meaning panels retain roughly 87–90% output after 25 years. That's a slow, gradual decline over decades. A sudden production drop, on the other hand, usually points to an equipment issue (inverter, connector, string fault) — the right first move is to have your installer or O&M provider check the system before scheduling a clean. Soiling losses are largely recoverable with professional cleaning; degradation is not.NREL Photovoltaic Degradation Rates Review

Wisconsin subjects panels to a relentless four-season cycle. Winter brings road salt spray and deicing chemicals that drift onto rooftops. Spring pollen from oak, birch, and maple creates a sticky biofilm that rain cannot remove, NREL research specifically identified pollen as a persistent soiling agent. Summer adds agricultural dust and fertilizer drift. And hard water across Southern Wisconsin (about 18–22 grains per gallon) means even well-intentioned garden-hose cleaning leaves mineral deposits.NREL: Soiling Research Overview

Exact dates vary year-to-year with weather, so I book on-demand and let your monitoring app guide the timing — the moment production starts tracking below last year on the same clear-sky days is my cue. An optional fall cleaning before shorter daylight hours can further optimize annual output; winter cleaning is not recommended (ice, snow, and sub-freezing water create scratch risk).

Often, yes. Agricultural and rural sites generally see more airborne dust, from harvesting, fertilizer application, unpaved roads, and equipment activity. Soft farm dust builds a film that rain doesn't lift well, especially along the bottom edge of low-tilt panels. If you're near farms and can see buildup on your glass, cleaning helps.

This is where cheap crews cost you a system. A boot on the glass can microcrack cells that keep producing for a year or two before the hotspot forms, long enough that the connection between the walk and the failure gets lost. My rig stays grounded; your panels and your warranty stay intact.

The honest version: bird droppings are a non-negotiable cleaning target because the uric acid etches glass and creates localized hotspots that degrade the whole string. Nesting is a different problem — once a colony is established, you need an exclusion specialist to seal the gaps, and I won't try to upsell you something I'm not the right tradesperson for. What I will do: document the nesting access points with before/after photos so your installer or a wildlife-exclusion pro has everything they need.

Most residential systems take 30–45 minutes depending on soiling. Larger commercial installations may take 2–3 hours depending on access and system size. I work efficiently while maintaining quality standards, and you don't need to be home.

I serve Southern Wisconsin, the 15-county Wisconsin DHS Southern Region anchored on Madison. That covers Adams, Columbia, Crawford, Dane, Dodge, Grant, Green, Iowa, Juneau, Lafayette, Marquette, Richland, Rock, Sauk, and Vernon counties (Madison, Fitchburg, Sun Prairie, Middleton, Verona, Waunakee, DeForest, Oregon, Stoughton, Mount Horeb, Janesville, Beloit, Monroe, New Glarus, Brodhead, Baraboo, Reedsburg, Portage, Lodi, Dodgeville, Mineral Point, Spring Green, and surrounding cities). Don't see your city? Request a quote anyway, chances are I can help.

I lead with pole-fed 100% deionized water applied through a soft rotary brush matched to your panel manufacturer's cleaning instructions. A panel-specific biodegradable soap is added only when the buildup calls for it. No pressure washing, no foot traffic on the glass. This matches the cleaning method published by every major panel manufacturer, so your warranty stays intact and the DI rinse leaves zero mineral residue.

Every job is unique, no two roofs are the same. The fastest way to see your exact price is my free instant calculator on /pricing (Residential tab), enter your panel count and home style and you'll see your price in seconds, no contact info required. Commercial, agricultural, and government sites are custom-bid. Submit your facility details through the Commercial tab and I'll personally deliver a written bid with firm pricing within 24 hours.

Because roof pitch, panel count, and access all shift the number, I don't publish a flat per-panel rate on my marketing pages — the calculator at /pricing is the fastest honest number for your exact roof. Pricing formula: `final = max(panels × rate, minimum)` — I charge whichever is greater, never both.

Nothing bad. Rain that falls within a day or two of a Solar Alchemist cleaning is just water on already-clean glass, the deionized rinse leaves no mineral residue for the rain to redistribute. If you ever notice streaks, spots, or unusual debris within 48 hours of my visit, text me and I'll schedule a complimentary touch-up. I stand behind my workmanship, the glass will look right when I leave and hold up against normal weather.