Hi Ginnimilner
If you are absolutely certain that the hog has vacated the hog house, you could clean it out. Ideally it needs cleaning before another hogs might move in – not least due to the possibility of external parasites or their eggs.
Check carefully that there is not still a hog in residence – some may still be hibernating.
Boiling water needs to be used to clean out hog houses to kill any potential parasite eggs. Don’t use chemicals.
More information here:
https://www.hedgehogstreet.org/cleaning-out-boxes/
After it’s cleaned you could put in a handfull of material to give them the idea, but otherwise it’s best to leave it to the hogs to choose their ‘furnishings’. So make sure there is material in the neighbourhood which they could use.
Good luck
