Cement Dust on Panels

We live in a rural part of a developing nation and rely on solar to meet our needs. The issue I’m having is the accumulation of cement dust on our panels from a nearby cement factory. It’s obvious they don’t have any type of filtration as the smoke leaves a residue of cement on anything outdoors. I’ve tried various solutions/chems/soaps to clean and about the only thing that works is an industrial strength bathroom cleaner, which I’m sure will damage the panels over time. Any suggestions on what might work best to clean our panels?

We live in a rural part of a developing nation and rely on solar to meet our needs. The issue I’m having is the accumulation of cement dust on our panels from a nearby cement factory. It’s obvious they don’t have any type of filtration as the smoke leaves a residue of cement on anything outdoors. I’ve tried various solutions/chems/soaps to clean and about the only thing that works is an industrial strength bathroom cleaner, which I’m sure will damage the panels over time. Any suggestions on what might work best to clean our panels?