Credit to
@Swarm who has provided most of the experience.
There's been a rather fragmented discussion in the "What did you do in the Apiary?" thread about clearing supers so at a member's request here is a brief synopsis which will go in the STICKIES
Clearing supers away from the hive, rather than over one colony, is a quick way to clear a number of them with just one or two clearer boards.
You need a warm day when the bees are flying. Put a clearer on a hive stand, add supers and top with a crown board and roof. The bees will exit and return to their hive leaving the pile of supers ready to take away the next day.
I've done it and it works very well, leaving just a few bees on the frames.
You can even mix supers from different colonies. They do not fight.
If you have quite a stack you can flip another clearer upside down and put it on top. Obviously you don't put a roof on that.
Perhaps folk can add their experience.