I don't but my wife and HS daughter seem to like the things, I think they are a waste of good money, but some battles just aren't worth fighting. I clean and vac the seats, carpet in the vehicles once spring and fall and then I drive with the windows a bit on all but the coldest days and that helps. My dad used to toss a couple of lumps of charcoal in the vehicles which would absorb odors pretty well. I am no fan of the scented house candles that my wife uses either. The smell of fresh brewed coffee in the morning is all I need.