Solar panel cleaning in Oregon

Solar panel cleaning in Oregon typically costs $150–$320 per visit, and every metro we track carries the same recommended cadence of 1–2× / year. That relatively light schedule is Oregon's wet season doing free work: for much of the year, steady rain rinses grime off panels before it can harden. The window that matters runs May–Sep in Eugene and Salem and Jun–Sep in the rest of our listed metros, when pollen from the Willamette Valley's grass-seed fields, dust kicked up by farm equipment, and increasingly common late-summer wildfire ash settle onto the glass with no rain to wash them away.

The metros differ more than the shared cadence suggests. Bend is the state's fastest-soiling market at rank 22 on our national grime index — high-desert dust and scant rainfall east of the Cascades leave panels dirtier than anywhere in the valley. Eugene (rank 28) and Salem (rank 30) follow, their May–Sep dust seasons opening a month earlier than the Portland area's thanks to grass-seed pollen and agricultural traffic. Hillsboro (rank 33) and Gresham (rank 36) soil slowest, but Portland-area labor shows up in the bill: Gresham runs $200–$320 and Hillsboro $175–$300, against $150–$300 in the other three metros.