Solar Express Solar Panel Cleaning Services, LLC is a family owned and operated business out of the Inland Empire who specialize in solar panel cleaning so that they work efficiently all year round. Solar panels are a big investment, which is why not only are we fully licensed and insured, but we use the best equipment and modern technology to keep your panels clean. We only use Reverse osmosis Deionized pure water to ensure your solar panels are spotless. We want to protect your investment so we will never use any chemicals or unfiltered water that will void your warranty.