+1 Zaino is the best, but it's also the most expensive.
Meguiars or Mothers are both good, moderately priced products. Do you use a clay bar before you wax (and polish)? You should. Otherwise you're just waxing over grime and dead bugs.
Paulie i first use Dawn dishwashin soap with the clay bar, then I still have my old bottle of Z1. Let that stuff dry off, and apply the Z2.....then finally finish it off with Z6. Pretty good workout but worth the awesome result and shine!