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The CarScenter diffuser is manufactured by Hubmar and is available under a variety of other brand names, but all are the same. This is a passive evaporation device which uses low heat to aid evaporation. Of course, any time we do something like apply heat (or a fan) to a volatile substance it will evaporate quicker. This is the main downfall of most passive diffusers. Like the terracotta car diffuser, the type of oil you use will make a difference in both the level and longevity of the scent. Citrus oils such as lemon or orange tend to have mild scent that dissipates quickly. Stronger scented oils like Eucalyptus and middle and base note oils such as Rosemary, Pine, or Patchouli will last longer.
To use this diffuser you apply a few drops to the cotton pad of the unit and plug it in to your car’s cigarette lighter. The power from the lighter heats a small plate which helps to evaporate the oils. You can recharge the pad every couple of days with more drops. To change scents, you can either use one of the refill pads that comes with most units or let the scent on your pad evaporate for 3-4 days before adding a different scent.
Pros: natural car air freshener, diffuse oils in your car, easy to use and maintain, inexpensive
Cons: uneven evaporation