Whether solar panels become dirty depends on the local conditions. Under normal circumstances there should not be a problem, because the panels do not get dirty enough.
A new and interactive online map helps to highlight exemplary projects in modern city planning to do with solar systems. It is targeted at city planners and architects who are involved in implementing state-of-the-art city quarters.
There is one common problem with tracking systems: The trackers are susceptible to aerodynamically induced vibrations. This can be solved with a self-locking mechanism that transfers the forces to the individual supports.