How long does one can last?

Gel fresheners typically last 3–4 weeks depending on your climate and how often your vehicle is in use. Warmer temps speed evaporation. You'll notice the scent gradually fade, which is normal.

Will this stain or damage my dash or seats?

Gel fresheners don't leak or drip like liquid air fresheners. Keep the can upright and away from direct sunlight to avoid any potential seepage. If you're sensitive to direct contact, use a vent clip to create distance from your interior trim.

Can I use this in a vent clip or does it need a cup holder?

The 2.12 oz can works with standard vent clips or cup holder mounts. Vent mounting gives you better scent distribution and keeps the can visible and easy to replace when it expires.