The TW liquid rubbing compound that came out a year(or two?) ago might not be that bad, but definitely avoid the stuff in the little white cannisters. I seem to remember someone posting some decent results from the liquid version of the rubbing and/or polishing compound here on the board sometime within the past year or so. A quick search would probably find the post I'm thinking of. If I remember correctly, someone tried out the TW polish on a white car with good results.
EDIT: I went ahead and found that old post for you:
http://www.autopia.org/forum/detaili...echnology.html