Dish soap will strip the wax...
If you drag your hand over the surface and it feels gritty - you can you a paint cleaner (Step 1 in the Meguiars 3 step - Cleaner-> Polish-> Wax)
If the cleaner is not effective - go to a clay bar. If that doesn't work then you need to step up to a buffer with a decent pad and a slightly more aggressive paint cleaner (notice we a NOT talking a compound - use that and your paint is going to be toast!). If a clay bar doesn't cut it - seek a professionla detail shop. Doen't risk the paint ...
Good forums for paint detailing:
http://www.se-r.net/car_info/clean/detail.html
(of course b/c I wrote it!)
http://www.carcareonline.com/howto_articles.html
http://www.goodspeedmotoring.com/
http://forums.mbworld.org/forums/for...?s=&forumid=37
crap - there is another good one - just can't remember it right now..... good luck
