Aromas such as roses, baking bread and cut grass are to be piped into "smelly" car parks more commonly associated with the stink of urine and vomit.
A survey by car park firm NCP found the smell of car parks was driving away as much as a third of potential custom.
The company is using new technology to pump pleasant smells through the stairwells of its busier sites, such as London, Birmingham, Leeds and Cardiff.
Flowers came top in their smell poll, then mint, cut grass, bread and fruit.
Bubblegum, coffee and even petrol were also considered favourite fragrances.
NCP chief executive Andrew Potter said: "We are committed to offering our customers a pleasant and positive experience in our car parks and we fully recognise that unpleasant smells could drive customers away."