I use Autoglym rubber care which is also a conditioner as Dean described. For door seals I spray it on a microfibre and apply it that way so it doesn't get on trim or paintwork.
I would be strongly disinclined to try and remove the glass from the frame. I did this recently and it is very tricky to get back in. It also comes with a high risk of breaking the glass if you tweak the pins the window runs on. Any competent tinter should be able to do it in the frame. The pins are in the masked area of the glass anyway.
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