Why we clean solar panels with pure water only
What the O&M best-practice guide says about cleaning methods.
Oct 27, 2026 · Premier Solar Service
Follow the manufacturer
NREL's O&M best-practice guide says to follow the module manufacturer's cleaning recommendations, and warns against high-pressure water, solvents, abrasives and harsh detergents.
Pure water, soft brushes
We use reverse-osmosis, deionized water with a TDS level below 7, fed through soft brushes made for solar glass. Pure water dries without leaving mineral spots, so no soap or chemicals are needed.
Uneven soiling is a risk
The same guide notes that uneven soiling, such as bird droppings, can lead to localized hot spots. That is why we pair cleaning with bird abatement where pigeons are nesting.
Talk to Premier Solar Service
Call or text (209) 800-3600 or send the quote form.
Solar panel cleaning, bird abatement and inspections. Fresno • Clovis • Tracy • Manteca and the Central Valley.