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Q1: You can probably remove that sealant with a heavy wash of dishwasher detergent and water.
Q2: You can apply Zaino to everything (I don't apply it on windshield though)
Q3/Q4: You don't need a PC to apply Zaino as you'd be wasting it. (Only if you need to use Z-PC or an abrasive for really bad swirls/scratches.)
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