I’m waxing the z today. The first time since I’ve owned it. I noticed lots of black comes off all the rubber trim.

 

What’s the best thing to do to preserve all the rubber trim?

 

 

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Some sort of rubber conditioner. Not Armoral. Do some research and you will find something that conditions rubber.

Meguiars Hyper Dressing

If your rubber is giving off black residue, then it’s pretty dry / has had UV reactions etc.

I would consider something like this:

https://www.theleathercolourdoctor.co.uk/car-rubber-seal-reviving-kit-contains-cleaner-and-conditioner-classic-vintage/

But there are a tonne of rubber dressings out there. I use them on the Audis - while we don’t get very cold winters in the Uk we do get some super freezing mornings a few days a year and I’ve found rubber seals freeze to each other unable to open the door - so it’s worth considering them on your more modern cars too.