How long does one canister last?

That depends on your cabin size and how hot it gets, but gel fresheners typically last several weeks of regular use. You'll notice the gel shrinking as it releases scent—toss it when it's gone and grab a fresh one.

Where should I place this in my car?

Mount it where air flows naturally—cup holders, center console, or hanging from a vent work best. Keep it away from direct sunlight and extreme heat to avoid faster evaporation.

Will this stain or damage my interior?

The gel is contained in the canister, so there's no leaking or dripping. Just make sure it's stable and won't tip during hard cornering.