How long does this air freshener last before it needs replacing?

That depends on your cabin climate and how much you drive. The 200-gram gel formulation is designed for long-haul scent, but heat and ventilation will speed up evaporation. Most users get 4–8 weeks of noticeable scent.

Can I place this anywhere in my car, or does it need a specific mount?

The gel form works on your dashboard, center console, or hanging from a vent clip — mounting method is your choice. Just keep it away from direct sunlight and extreme heat to slow evaporation.

Will this scent clash with other air fresheners or detailing products?

Cologne scent is subtle and blends well with most cabin environments. If you run multiple fresheners, the cologne note tends to complement rather than compete. Start with one and adjust if needed.