Frequently Asked Questions
Clear answers to your solar maintenance, window cleaning, power washing, warranty, and efficiency queries.
It's simple math: dirt blocks sunlight. Layers of dust, pollen, bird droppings, and urban smog act as a physical shield over your photovoltaic cells, passively stealing up to 25% to 30% of your energy output. Cleaning them immediately restores that lost power.
Yes! In addition to solar panel cleaning, Panel Wash Pro provides professional pure-water window washing and heavy-duty power washing (pressure washing) for driveways, patios, commercial walkways, and building exteriors throughout the Bay Area.
Relying on rain to clean your solar panels is like relying on rain to wash your car windshield. Rain might rinse off loose top-layer dust, but it leaves behind hard water spots and fails against baked-on grime, pollen, and sap. Tech-agitation with pure DI water is required to restore true transparency.
No. We use strictly 100% pure de-ionized water with zero harsh chemicals, soaps, or abrasives. Using tap water or chemical detergents can leave mineral scaling or void manufacturer warranties. Our laboratory-grade DI water cleans safely and dries 100% streak-free.
We recommend bi-annual cleaning (every 6 months) for most residential arrays in the Bay Area. Properties located near busy highways, construction zones, or agricultural areas benefit from quarterly cleaning to prevent heavy build-up.
Yes, Panel Wash Pro carries full liability and workers' compensation insurance. Our technicians are OSHA compliant and trained in commercial and residential roof safety harness protocols.