Lampe Berger by Maison Berger! Around since the late 1800s Lampe Berger started in hospitals to get rid of bacteria in the the air. They became popular in the 30s in smoking salons, and when they came to North America were even mostly sold in Smoke Shops. Today people love them as they not only add fragrance to the air, but they actively get rid of odours and 66% of bacteria in the air. It takes 20 minutes for 200 sq feet, but you can let them go for up to 2 hours for more persistent odours; then cap it. Use the Neutral to get rid of odours without adding fragrance...Or mix it with a scent for a more subtle fragrance.