If you want to get serious, you could try some professional products, or find a detailer which uses a similar array and approach:
http://www.topoftheline.com/comodwipsys.html
Other options to consider, which I have not tried and cannot recommend one way or the other, include:
http://www.forceoutproducts.com/how_to5.htm
http://www.winsol.com/odorcontrol.htm
Good luck!