Our house is pretty old. It had an old house smell when we bought it. It's not a mold smell, not a sewer, not cat urine. It's a smell of old wooden furniture or books.
The house has hardwood floors and lots of wood trims. We renovated the place, sanded all hardwood floors, removed old carpet, varnished all wood trims and painted all walls.
The odor almost disappeared, but I can still smell it. I'm sure it's going to go stronger over time.
Do you know what the smell might be coming from? Maybe attic needs to be treated somehow? Maybe stuff that penetrates walls can be used like Room Shocker? Any other ideas?