All those solar panels need to be cleaned. I wonder what it costs for John Kerry to have his windows washed?
Funny you should mention that.
A NASA Mars mission was hobbled and ended early due to dust collecting on the deployed solar panels, almost immediately reducing solar power production capacity down to 15% of nominal/expected.
They actually intentionally remotely dumped scoops of Mars dirt on the panels in an attempt to shake off dust and it actually bumped up power output to 25% of nominal. They had no other options.