Do solar panels really need to be cleaned in Wisconsin?

Yes. Wisconsin's mix of pollen, agricultural dust, industrial particulate, bird droppings, and snow-melt mineral residue silently builds a film on the glass. NREL Fleet Performance field data documents 5–15% of production is typically lost to soiling each year (higher in agricultural and industrial zones). Rain only rinses loose dust; it can't lift baked-on grime. A warranty-safe cleaning helps recover that lost output — on the Wisconsin State Capitol's 16-year-old array we independently measured a +16.7% production lift. Individual results vary by system age, orientation, and soiling level.

Will rain clean my solar panels?

No. Rain washes off loose dust but actually makes long-term soiling worse. Each rainfall leaves hard-water mineral spots and concentrates fine particulates at the panel edges, where they bake into a permanent film. Studies from NREL and IEA-PVPS show rain-only sites still lose 5–15% of annual production to soiling. Mechanical cleaning with deionized water is the only way to fully recover that output.

How much output can I recover by cleaning my panels?

NREL field data documents a 5–15% typical soiling-loss range on most residential systems and up to 15–20% on agricultural / industrial commercial arrays. Cited case study: our independently measured cleaning of the Wisconsin State Capitol's 16-year-old rooftop array delivered a +16.7% production lift on that specific system. We do not guarantee any specific percentage recovery — every system is different (age, orientation, tilt, local weather, soiling level all matter). We frame the value of cleaning as recovering lost production and extending the life of the investment.

Do you use chemicals on the panels?

No. Solar Alchemist uses 100% deionized pure water with soft-rotary brushes — never harsh chemicals, never abrasive pads, never high-pressure water. Deionized water has no minerals to leave spots and lifts soiling on its own; the soft brushes contact only the glass surface. This is the only method explicitly approved by every major panel manufacturer (LG, Panasonic, SunPower, REC, LONGi, JinkoSolar).

Does cleaning void my solar panel warranty?

No — our method preserves every major manufacturer warranty. Chemical cleaners, abrasive pads, pressure-washing, and any foot traffic on the glass all void panel warranties. We use none of those. The deionized water + soft-rotary brush method is the only technique explicitly recognised as safe by panel manufacturers and is documented in our written Warranty Preservation Rule provided with every quote.

Do you clean commercial solar arrays?

Yes. We clean commercial, agricultural, government, and multi-site arrays from 100 to 5,000+ panels across Southern Wisconsin. Every commercial site receives a custom written bid within 24 hours — no published per-panel rate. Net-30 invoicing on commercial accounts; Certificate of Insurance (COI), W-9, and procurement documentation provided on request. The Wisconsin State Capitol is one of our reference installations.

(608) 571-4173

Solar Alchemist Blog

Notes from the roof.

Field notes, case studies, and honest answers from Marquis Mason — a local Dane County owner-operator who cleans solar panels across Southern Wisconsin. New posts drop as the seasons change.

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Lost 5–15% production to soiling?Get Free Quote (608) 571-4173