Hi Dan - welcome to Autopia!
While I can't speak for everyone, here are my experiences in regard to your questions:
1) It's possible, but it's difficult. You end up using much more product than normal, and it is slightly more difficult to remove. I'd really recommend trying to find some shade.
2) Zaino can be removed a number of ways:
a) A heavy Dawn wash with claying afterwards
b) Isopropyl Alcohol (time consuming)
c) An abrasive product like SMR, DACP, etc.
d) I'm guessing ABC wash would strip it too, but I haven't confirmed this.
-- you can search the archives for info on all of these products --
3) It's safe for plastic trim, and it won't stain it, but I'd still try to avoid the majority of your black plastic trim. It's ok to use on
headlights/tail-lights; no worries.
4) I apply it to my wheels (which generate a lot of brake dust), and while it doesn't noticably reduce the amount of brake dust accumulation, it is much easier to wash away (I just use a strong stream of water and a quick pass with my rim-only wash mitt).
Hope this helps, and welcome aboard.
