How long does one 200g brick last?

Solid bricks typically work for several weeks depending on cabin size, ventilation, and how enclosed the space is. Start with it in an active area like under the seat and move it to a less trafficked spot once the scent mellows.

Will this work in other spaces besides a car?

Yes. Any enclosed or semi-enclosed space benefits from it—toolboxes, closets, boats, RVs, or small offices. Just make sure air can circulate around the brick for even scent distribution.

Does the brick leave residue or stain upholstery?

Solid bricks don't leak like gel fresheners, so residue risk is minimal. Keep it away from direct contact with fabric and avoid placing it where condensation or heat could cause the brick to soften onto surfaces.