Ok, a quick question. How much social grooming happens in the hive. While watching the hive entrance I took the following pictures. A couple of pictures are hopefully below. Lots of the girls are washboarding, but a few seem to be grooming other bees. The bee being groomed stands still with wings fully extended (can't tell in the picture) while the other bee seems to move over it. I have read that help is required to remove propolis. Is this what it happening there or do they have cleaning stations?