I always tape the vehicle off prior to polishing, I don't like getting the plastic trims full of polish. I've been using the green 3M Automotive tape, works quite well for me.
As for dressing the plastic trims, I've done that in the past but find that it makes it harder for the tape to stick to it, so I don't do that too much.
When I'm done polishing and I remove the tape, yes you'll have the famous white polish residue. It's quite easy to remove, I usually give the vehicle a final wipe down or simply just re-wash the vehicle with a concentrated solution of P21S Total Auto Wash. The reason I say wash is becuase whem I use Menzerna Power Gloss it dusts quite a bit so it's better to simply wash the vehicle.
Well that's jus what I do, hope this helps.
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