How long does one brick last?

Longevity depends on cabin size, ventilation, and how you position the brick. In a compact car with moderate airflow, expect 3–4 weeks of noticeable scent. Placement near an air vent speeds evaporation; tucking it under a seat extends it.

Will this stain or damage my interior if it melts?

The brick is designed to stay solid at normal cabin temperatures. If you leave the car in extreme heat with windows closed, some softening can occur — place it on a plastic tray or in a cup holder to be safe. Avoid contact with leather or fabric seats.

How do I install or use this?

Remove it from packaging and place it in your cup holder, dash cubby, or under a seat. No installation needed. When scent fades, replace with a fresh brick.