Dave, Cleaned several times. (Passed once, heavy smoke smell & thick yellowing). I charged going hourly rate. At the time $50 an hour (More now). They cleaned up quite easy. Mostly dusty.
When they asked how much, I said my rate. Said I only did quality work at a fair price, when do you need it Done? Booked and cleaned. Another happy satisfied customer!
Dave, I have done them a couple of times. We also did the flipper doors and chairs. I charged $40/hour, two years ago. The panels cleaned fairly easily. The customer preped the work stations so I had a clear shot at the panels. Desks where cleared off. All furniture etc. moved away from the cube panels.