Escalon orchard dust is a different problem than city dust
Almond and walnut ground around Escalon throws a heavy, sticky agricultural dust that bonds to glass instead of blowing off.
Escalon arrays sit inside working farm country. Discing, harvest shaking and orchard traffic on Escalon-Bellota Road and the county lanes loft a coarse dust load that a suburban array never sees, and it settles densest on the lower module row.
During bloom, that dust arrives mixed with pollen and orchard spray residue. The combination forms a film that survives rain, which is why Escalon owners who wait for winter weather to clean their panels are disappointed every year.
Well water, hard water and the finish rinse
Most Escalon properties are on well or hard district water, which spots glass badly if it dries on the panel.
Rinsing an array with a garden hose out here leaves mineral rings that shade cells exactly the way dust did. The deposits then need chemistry to remove, not another rinse.
Exterior Prime professionals bring their own deionized water for the final pass, so the panel dries clear. Nothing about the wash depends on the water quality at your bib.
Ground mounts, shop roofs and long lots
Escalon has more ground-mount and outbuilding arrays than any tract city we serve, and each layout changes staging, not the per-module rate.
A ground-mount row behind a shop, a barn-roof array and a house-roof array are all $20 per module standalone. What changes is how long the day takes and where the hose runs from.
Long rural driveways mean the truck may park well away from the array. That is planned into the appointment length, and it never becomes a line item on the invoice.
Measuring the result instead of assuming it
We record the production figure before and after, so the wash is judged on output rather than on how the glass looks.
Clean glass is easy to photograph and easy to oversell. The number that matters is what the inverter reports at the same hour before and after the wash, and that is documented in the same email as the photos.
If the reading barely moves, the problem is not soil — it is shading, a string fault or an aging inverter, and you should be spending money on a solar technician rather than another cleaning.
