Solar Panel Cleaner concentrate creates a protective coating on solar panels that repels water and slows down the buildup of dirt. It’s eco-friendly and won’t harm the environment. Plus, it allows 100% of sunlight to pass through. How to Use: For a thorough cleaning, mix a 1% (100 ml in 1 liter of water). For daily cleaning, use a 0.5% solution (100 ml in 2 liters of water). Apply the solution to the solar panel with a garden hose and wait 1-2 minutes. Then, rinse it off with a high-pressure washer. Note: Use cold or lukewarm water. Using demineralized water can prevent water stains. Avoid using this product in direct sunlight.