I have a few scenes which seem to be "washed out" in terms of contrast and
color saturation.
Is there any "setting" that would improve (increase) those areas?

I typically use both radiosity and photons.

My lighting and camera look like this:

#version 3.5;
global_settings {
   assumed_gamma 2.2
   max_trace_level 25

   radiosity{
      pretrace_start 0.08
      pretrace_end   0.02
      count 80
      nearest_count 5
      error_bound 1
      recursion_limit 2
      low_error_factor 0.5
      gray_threshold 0.0
      minimum_reuse 0.015
      brightness 1
      adc_bailout 0.01/2
      save_file "OutsideIn IIA.rdf"
      load_file "OutsideIn IIA.rdf"
   }

   photons {spacing 0.017 gather 100, 100 expand_thresholds 0.2, 30 autostop
0}

}

camera {
   location <0,0,-3.5>
   look_at  <0,0,0>
   rotate <-20,-10,0>

}

light_source {< -200, 200, -200> color White * 1
    photons {
      refraction on
      reflection on
      area_light
    }
}

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