Zaino should be applied by hand too. The Porter Cable is going to take out the swirl marks and etching from the bird poo. I just finished polishing my entire car with Wolfgang Total Swirl Remover 3.0 and a Porter Cable. I'm going to apply Zaino ZCS, ZAIO, Z5, Z2 and Z8 this week. PM me if you need more info on this process - It's a lot of work and money though.
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