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To remove stains, yes.
Black trim - I use to use Chem Guys New Look Trim Gel. I now use GTechniq C4.
Scratches - where, how bad, do you have a machine... etc.
As above, if it's from a decent bodyshop that have baked the item in the oven, you can wax and polish straight away.
Re a decent sealant, Chem Guys Blitz is a good option for long lasting protection and great looks. Easy to apply and top up as well.
A decent foaming leather cleaner, Northerner. That would be my first stop. Use the age old "least aggressive first". Then move up to G101 diluted on a small test area.
It's not a precise science to be honest. I have used SRP and other polishes on my glass for years and never had any issues. In the same respect, I have used waxes on my front screen before and never had any issues.
However, there are specific glass polished (Auto Glym Glass Polish being one...
ITR is fine. And if you're happy with fine, that's fine.
The simple fact is Tardis is doubly as good. It is also technically cheaper, but you have to buy 5L of it.