You might want to give GR-40 a try..... I tried it out briefly and it worked great at removing the wax.... just need to follow the directions closely...
It's available at Top of the Line - http://www.topoftheline.com/trim-cleaner.html
There's alot of positive reviews over at the Roadfly Detailing Forums - do a search on "GR-40" at that site.. http://forums.roadfly.com/forums/detailing/
Anyone using Zaino should also check over there - lots of great tips and advice