Customer wants to clean the panels with a pressure washer and some soap. Is that OK?

Plain explanation

JinkoSolar's manual recommends cleaning with a soft cloth, dry or damp, and neutral water with a pH of 6.5 to 8; water with high mineral content can leave deposits. Abrasive material must never be used, and chemicals are not recommended because they can affect the warranty and yield. If a hose or backpack-style pressure set is used, water pressure should be below 675 kPa. Clean in the early morning or late afternoon when modules are cooler, and never clean a module with broken glass or exposed wiring.

Steps from the source

1. Soft cloth, neutral water (pH 6.5–8), no abrasives or chemicals
2. Pressure under 675 kPa
3. Early morning or late afternoon
4. Skip modules with broken glass or exposed wires: shock hazard

"If using a hose or backpack style pressure set we recommend the pressure of the water should be less than 675kPa."

Word for word from the source.

Source

Where installers ask this

• How do you clean your panels? (r/SolarDIY)

General guidance based on the manufacturer's manual or the named source. Always follow the current manual for your exact model and your national code. DC and AC electrical work is for qualified installers only. Not affiliated with or endorsed by any brand named; trademarks belong to their owners.