Manufacturers say clean only with clean water using clean soft cloth or clean soft sponge. To remove snow, use soft-bristled brush with soft bristles to gently remove snow. But what do they know?
Some company's ads state the panels can withstand hail and heavy rain, I bet a conservative wash with a power washer from a DIY carwash would be okay, on the rinse setting so it's not soapy. Just a thought.
C.
I've cleaned my panels at both DIY spray carwash and brushless automatic washes. I've had no problems. My panels are the older version. Don';t know whether that makes them more, or less, durable.
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Mac McIntire
2003 Ford E250, 5.4L V8,