Things that have genuinely made my car smell bad =
A spilled pint of milk over the carpet
The French cheese my friend insisted in buying in the south of France to bring home to Wigan
A very wet Old English Sheepdog
Dreadful women who douse themselves in even more dreadful perfume - believe me Little Hawk cigs are nothing compared to that!
Oh! and the chicken I forgot in the boot for a couple of weeks

BTW anyone want to buy a second hand car? - one 'careful' lady owner :>)