Air fresheners such as plugins, scented oils, scented candles, and sprays are not recommended for hedgehog health because respiratory systems are too sensitive to handle the strong smells. You should really stay away from them. Some hedgies can't even handle the scent of laundry detergent. (Please note that you don't have to use unscented laundry detergents if your hedgie hasn't had any problems; some are just more sensitive than others, and this is just an example of how sensitive some can be.)

If you notice a smell in the room and you would like to eliminate it:

- Try placing a bowl of baking soda in the room.

- Alternatively, buy an Arm & Hammer Fridge-n-Freezer Odor Absorber.  This has no scent and won't make a mess. 

- Sprinkle baking soda on the carpet and furniture, then vacuum it up to help eliminate odor from those areas.

- Use a vinegar/water solution in the cage to help eliminate urine odors.

- If you use liners, wash them with vinegar. (If there's really a smell, soak in hot water and vinegar for 30 minutes before turning wash cycle on.)

- Sit a bowl of white vinegar in the room, instead of a bowl of baking soda.

- Put a dryer sheet on the back of the door to the room the hedgie is in so you smell a fresh scent when you open/close the door.

- Buy a good air purifier.

All of these ways are considered hedgie-safe, tried and true.