Dust causes regular problems beyond the build-up of grime over the years. But your exact location also plays a big role in how much this can affect your system, and what triggers it.
A bit of dust might not have an effect, according to tests done by Ontario Solar Installers, because light can still get through. They recommend that you let nature take its course, as rain will accomplish most of the task of solar panels cleaning.
Nick doing great work with his solar panel tool!
Before and After