Quick answer
The practical explanation
Rain can remove some loose dust, but it may not remove adhered pollen, bird droppings, organic buildup, or debris trapped around the array. It can also leave residue depending on local conditions.
What to know
Three points to keep in mind
- Look for persistent buildup after panels dry.
- Do not judge performance from appearance alone.
- Debris beneath or around panels may require separate attention.
For your home
A site-specific answer still matters
Solar results and service needs depend on the roof, equipment, shade, household electricity use, utility requirements, and the condition of the existing system. Use this guide as a starting point, then have the property and equipment evaluated before making a major decision.
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Authoritative references
This article summarizes general consumer information and is not tax, legal, insurance, engineering, or utility-rate advice.