A solar panel turns light into electricity. Dust, pollen, and dirt sit on the glass and block part of that light. One panel looks only a little dull. A whole plant of dull panels is a real loss.
Rain helps, but it does not always clear a film of dust, especially in a dry stretch. A planned wash puts water on the glass in a controlled way, row by row, instead of hoping the weather does it.
Waiting is the costly part. A manual crew can take weeks or months to get through a plant. A drone finishes much faster, so the panels go back to producing right away. The cleaning pays for itself because that power starts coming back the same day, not after a long queue.
If you know the size of the plant, or you can send a photo of the rows, we can talk about a first quote.