How many sprays does one bottle give me before it's empty?

Spray count depends on how many pumps you use per application. A light daily spray in a closed cabin typically extends the bottle over several weeks, but heavy use will deplete it faster. Start with 2–3 sprays and adjust to your preference.

Will this leave wet spots or residue on my interior?

Spray mist formula is designed to disperse quickly without pooling. A light, even application dries fast. Heavy spraying into fabric or leather will dampen those surfaces — treat it like any air freshener and use restraint.

Can I refill this bottle, or do I need to buy a new one each time?

Refill mechanism not specified — treat this as a single-use bottle. Once empty, purchasing a replacement is the intended approach.