Washing panels is expected, not forbidden. Washing them the wrong way is the risk. Panel makers write their rules into the installation manual, and at least one ties the warranty to following them.
What do REC and Panasonic say?
Only what their published documents state.
| Maker | Water | Tools | Warranty | Document |
|---|---|---|---|---|
| REC | Water at ambient temperature | See the full guide | Warranty valid only if the installation manual’s instructions are observed | REC quick guide to cleaning |
| Panasonic | Deionized water, free of grit, at ambient temperature | Sponge, microfiber cloth or soft brush | See the manual’s warranty section | Panasonic EverVolt user manual |
What puts a warranty at risk?
Habits that break common manual rules, and the damage they can cause.
Pressure washing
Can strip coatings and force water past frame seals.
Soap and solvents
Some manuals rule out detergents; residue also holds dust.
Cold water, hot glass
Both REC and Panasonic ask for water at ambient temperature.
Abrasive tools
Scrapers, steel wool and stiff brushes scratch glass for good.
Standing on modules
Weight on the glass can crack cells you cannot see.
Unapproved add-ons
Clips or guards fixed to frames may not be allowed; ask your installer.
How do I check my manual?
Find the model
Look on your install contract, permit packet or the label on a panel’s back.
Get the manual
Search the maker’s site for the model’s installation or user manual.
Read two sections
Find cleaning or maintenance, then the warranty conditions.
Keep a copy
Save the PDF with your install paperwork, and note who installed the system.
Does your method fit mine?
Our wash follows the strictest common rules: pure water at air temperature, soft brushes, no soap, no pressure washer, nobody on the panels. Send us your panel model when you book and we will read its manual before the visit. If it asks for something we do not do, we will say so.
Not sure what you have?
Email a photo of a panel label or your install paperwork, and we will find the manual for you.