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This is mostly about RTU's . For the most part, how in the well are we supposed to wash evaporator coils, drain pan and drain lines if we can't get to those parts EASILY to do that task.? Some of my customers do not want me to use any of those spray on chemical coil cleaners. So , I use a garden hose. It is awful difficult to not get water "down below" , what a PITA. But such is life! RTU's do get dirty, RTU's should be cleaned, RTU's should be built/installed so that they CAN be cleaned easily, maybe then evap coils will get washed.
Economizers? They make the task way harder!!!!!!!!!!!! Oh Yea!