Solar panels · 3 min read
Why you shouldn’t clean solar panels with a hose and detergent
Why tap water, detergents and high pressure are bad for solar panels, and the safe method professionals use: purified water and soft brushes.
- Tap water leaves mineral spots as it dries
- Detergents can leave a film and harm coatings
- Purified water and a soft brush is the safe method
Cleaning your own panels seems simple, but a few common shortcuts can leave them dirtier or even damage them.
The problem with tap water
Tap water contains dissolved minerals. When it dries on glass, it leaves spots that scatter light. Purified water has those minerals removed, so it dries clear.
The problem with detergents
Household detergents can leave a residue that attracts dust, and some can affect the anti-reflective coating on panel glass.
The problem with pressure
High pressure can force water into seals and junction boxes and damage the glass coating. It’s also risky on a roof.
The safe method
- Rinse loose dust with purified water
- Gently brush with a soft-bristle brush
- Rinse again with purified water and let the panels dry
- Never stand or kneel on the panels
Working on a roof is risky, so many homeowners prefer to leave it to a professional solar panel clean.
Frequently asked questions
When is the best time of day to clean panels?
Early morning or late afternoon, when panels are cooler. Cold water on hot glass isn’t ideal, and water dries too quickly in full sun.
Maidly looks after homes across Christchurch with eco-friendly methods and a 100% work guarantee on every service. Request a free quote.