It doesn't matter if you clean out your car at the end of every day or if you wash it on the regular. Because of its enclosed nature, it is bound to develop a rather unexplainable musty smell over time. This is why you need car care products like this Involve Music Series Retro soft gel air freshener. Masculine and long-lasting fragrance Scented with the rich and refreshing odor of lemon that's blended with exotic masculine notes, this gel-based car perfume lasts for up to 45 days. Does not include any harmful chemicals Containing no CFC or other harmful chemicals, this handheld car freshener does not induce any allergic reactions.