Well, I had the same problem when a (drunken) mate I was doing a favour for as a taxi - barfed all over the seats in my prelude all those years ago...
I swore (a lot!) by the shake n vac treatment...
Also, try loads of fabreze (even just POUR the damn stuff on) and also get one or two of them in car neutradol thingies (I got one of those in the car as it is)..... other than that, you're looking perhaps at a proper valet...
I'd invest in a proper kosher boot liner and/or some stronger bags too.
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