Febreze Car Linen and Sky Scent Car Air Freshener 2 ml Liquid

These last a long time.

These are the greatest little things. Work great for what they intended for HOWEVER, being someone who thinks outside the box, i clipped one on our room air purifier. Not only does it suck dust out of the air, now the room smells great. I imagine you could clip them on a regular fan as well. I would say you could even clip them on the furnace air vent but i havent done that yet! I'll be back for more!!