Honest answers
Do I need to clean solar panels?
The first paragraph is the whole answer. Sources, a checklist and nuance follow — no sales stake.
Most tilted residential arrays need little routine washing. Cleaning is worth paying for when monitoring shows a sustained soiling loss, debris is stuck, or the array is nearly flat in a dusty climate — not because a flyer says every spring.
Measure the loss before you buy a wash
Compare expected production to inverter monitoring after adjusting for weather. A whole-array step-down can indicate soiling; one weak microinverter often indicates equipment. Bird nests, leaves and construction dust are local problems that may need targeted rinsing.
Follow the module warranty: high-pressure washing and harsh chemicals can void coverage. Prefer water and soft tools with fall protection, or an insured professional. Steep second-story DIY cleaning is rarely worth the injury risk.
If annual professional cleaning costs approach the value of the lost kWh, skip it. If a nearly flat array sits under weeks of pollen with no rain, cleaning can be rational. Document before/after production when you do clean.
Before you decide
- Check monitoring against weather before scheduling service.
- Read cleaning terms in the panel warranty.
- Prefer ground-safe methods; avoid pressure washers unless the manufacturer allows them.
- Get insurance and method details from any cleaning company.
Sources
Source review: 2026-09-21. Links support the planning points above; they are not a quote, tariff approval or savings guarantee.