I have a Black Cherry Z. Bug guts are a definite problem. 24 hours on the nose of the car and the remains will etch the clear coat, even if sealed and waxed. Then it's clay bar followed by some time with the Porter Cable/Adams polishes (SSR -> SWH -> FMP). Often, I can skip the SSR.
I don't know anything about Zaino's, but Adam's rocks and the Porter Cable with some kind of machine polishing set is a must if you have a dark car.
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