Good post, Fireflybob.
There really is only one answer, isn't there ?
BEFORE STARTING, ALWAYS BE CLEAR BEHIND
Surely its one of the things we first teach a student, along with, for example, the presence of a Fire Extinguisher, the direction of the surface wind, the expected Taxi route, are the chocks in position or Brakes on ..........
I admit that there will be times when congestion may make this difficult but there is still no excuse. Aircraft can always be moved by hand. It only takes the will - not impatience.
Nobody has the right to blast dust, grit or grass clippings all over hangared aircraft - or the right to blast another aircraft which may be on jacks, untethered or unchocked.
Remember also that you may have to use a HIGHER power setting to start taxying. What effect is that going to have on aircraft close to you.
So, please, close that hangar door, move YOUR aircraft or get the OTHER aircraft moved and we'll all be happy.
Sleeve.