The best thing to clean solar panels with is plain tap water or filtered water, a soft-bristle brush, and a gentle garden hose. For stubborn spots, a tiny drop of mild biodegradable soap (like a small amount of diluted dish soap) can be used, but you must rinse it completely.

Essential Cleaning Tools You Need to Prepare:

Water Source: A standard garden hose with a nozzle that has a gentle spray setting.
Brush: A long-handled, soft-bristle brush or a water-fed pole designed to avoid scratching the glass.
Soap: Mild, biodegradable soap if grease or bird droppings are present.
Wiper: A soft rubber or plastic squeegee to clear away pooled water and stop water spots.

What to Avoid:

Harsh Chemicals: Never use Windex, window cleaners, abrasive powders, strong detergents, or harsh chemicals that can ruin the glass coating. High Pressure: Avoid pressure washers because high-pressure water can break seals or ruin the internal wiring. Energy Saving TrustHot Panels: Do not clean panels in the middle of a hot day when the sun is strong; cold water on hot glass can cause the panels to crack.

To safely and effectively clean solar panels, use plain water, a soft-bristle brush, and a gentle garden hose, adding mild biodegradable soap only for stubborn grime. Essential tools include a long-handled brush and a squeegee to prevent scratches and water spots. Crucially, avoid harsh chemicals and high-pressure washers that can damage the panels, and never clean hot panels in direct sunlight to prevent thermal cracking; instead, opt for early morning or late afternoon cleaning.

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