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Try using '1001 Upholstery & Carpet Shampoo'. It's cheap, easy to use and leaves a lovely refreshing smell on the fabric. That's what I used on my caravan furnishings and it's amazing how much cleaner the furnishings were too. 

 http://www.1001carpetcare.co.uk/index.php/1001-products/shampoo

Bicarbonate of soda is a natural deodoriser and is often found as one of the base ingriedients of products like 'shake'n'vac, the problem is that by wetting the surfaces your risking washing the smell deeper into the base materials of the fillings. 

If your seat base covers have the zip on fasteners it should be possible with care to remove the infills and wash them on a low tempreture with plenty of non bio and fabric conditioner. any buttons can easily be replaced with a bit of effort and a long upholstry needle, failing that, you might be better to opt for a new set of upholstry altogether.

Julia  

I don't think you will ever get rid of the smell. It is like buying a car that has had either dogs or smokers. We bought an ex demo model car and somebody had been smoking in it. I took it back to the dealers and they cleaned it out again. Lasted a week before the smell came back. Couldn't stand it so got rid of car in the end.

The smells get into the whole fabric of the van not just the seats etc.

I think your only chance is to change van.