Saharazand reaches Flanders: how do you best tackle those dirty solar panels and cars?

The rain of tonight also dropped a portion of Saharazand in various places in Flanders. That prove the images that readers send through 4040. As a result, solar panels can temporarily generate less electricity. Does this mean that you have to go on the roof for a large cleaning? And how do you get the Dound Wagen clean again as quickly as possible? A word of explanation with an annoying weather phenomenon.

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