Steam-clean the top?

[Ronzi]

Go to Pet Smart and get one of those dog stink remover contraptions. Looks kind of like a little hand vacuum cleaner. I think it's an ionizer, and probably costs less than anything from Sharper Image.
Didn't do much for the dog, but who knows what it might do for a convertible top.

[jwc]

Watch out for ozone machines, a restorer I know that uses them says that it "dizzolves rubber". They have a special room they fill with ozone to "de-stink" items and a portable ozone machine for location work, but say to make sure you never do it to anything with rubber in it. He also said it can have a bleaching effect on some materials (they lose color). I can't verify but this is what he told me.