While soap and dish detergent might seem logical, they are not suitable for cleaning solar panels.
Why not use regular soap?
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It leaves behind greasy residues that actually attract dirt.
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It can damage the coating of the solar panels.
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It increases the risk of streaks, which reduce efficiency.
What should I use instead?
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Use demineralized (osmosis) water without any additives.
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If necessary, use special solar panel cleaning agents approved by the manufacturer.
Conclusion
Avoid household cleaning products. They can do more harm than good to your solar panels.