Agree, car wax is not the ideal for billiard balls, though some seem to like it.
As K2, myself, and others have said, the Aramith cleaner, and restorer, for that matter, are formulated for billiard balls. I recommend them over auto products, which are designed for paint and clearcoat surfaces, with sun protection.
If, however, you absolutely must use an auto product, I would use a combination cleaner/polish, such as Klasse, which does work on products other than auto paint. I doubt seriously it would be better than Aramith, but if your craving is auto products, I suspect it's better than wax.
Stick to Aramith. But, I'll give it a little footnote. If you can get your hands on some Keickhefer's Billiard Ball Polish, it is also very good. Considering it's been out of production, I believe, since the 1970s, I don't think many will come across it.
I have a diamond single platter ball cleaner/polisher. On the diamond website, they recommend Meguiar’s Ultimate Detail wax.It works very well on the OB's. On the QB, it has the same effect on pool as , Fast Simonis 860, Faster Simonis 860 HR, and super Fast Simonis 760. Also, the same effect as LD shafts have had on the game. All of that has made pool much easier to play, especially for players with very little 'stroke'. A waxed QB has about the same effect on the game as LD's have....makes it easier to move 'Whitey'. I play with a 1973 JOSS cue. A waxed QB is much cheaper than an LD and does about the same thing , but with no 'Learning curve' on how to aim..
Good luck all.
http://www.diamondbilliards.com/Accessories/BallPolishers.aspx