In my game, there will be a multitude of mops with buckets of water up and down from the kitchens to the bedrooms. Preferable with a wizard sized mouse doing its nut!
I wonder how long it would take to find the smutty book and how much the PCs could sell it for?
Lots to find, although I think that I'd quote Goblin Punch's advice here "have things to experiment with*". I think you could have got away with more to mess about with outside the workshop and potion room.
*I always remember that after the event,"Shiny stuff to steal" is the easy one!
Maybe some of those other adventurers that tried to rob the place are still there...