The smell is the worst part. It goes away eventually but until it does, getting into the car after it's been closed up for a while is not pleasant.
We usually try to disguise the smell using one of those cardboard odour eaters that you hang from the rear vision mirror. I like the vanilla smelling ones the best. Today Coles was sold out of vanilla ones so I chose an "ocean" scented one shaped like a thong. But sadly it doesn't smell anything like an ocean.
I picture the smell of an ocean being fresh with just a hint of saltiness. This is more like the smell of a toilet cleaner (combined with the vomit smell I'm trying to remove).
At least I know it will get better. But the next few weeks of travelling in the car might be less than enjoyable.