Use rags to remove most of the honey and use a ganular absorbant on the horizontal surfaces and vac up. Honey is very hard to remove without using water to dillute it.
Most often there is no other choice but to seal the honey "film" up.
You can only do what you can do.
I do my best to contain the mess as I work, placing heavy plastic or a tarp directly under the cutout to catch the running honey. This time of the year when the colonies are loaded and a lot of it is uncapped nectar, I'll throw old heavy towels down on top of the plastic to absorb as much of the spill as I can. Then just roll it up and pitch the mess when I am done.
Yes you should fill the void, no you should not leave any honey or comb behind. Roll fiberglass insulation I have found works best for me to fill the voids.
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