Although it looks in good shape, exterior trim tends to accumulate dirt and grime over time.
My best tip on trim is to thorough clean it prior applying any protection (credits (as always) to Mike Phillips write-ups on this forum).
Once I've made an analogy that the guy liked so much I can share it with you:
'Covering a not cleansed trim with protectant is like using deodorant on a stinky axilla' - no Mike Phillips credits on this one!
Since I like mine/customer's trim mate/factory looking, after the cleansing, I'd coat it with Pinnacle Coating and let it there to preserve it...
If you want a glossy finish, you may look at another suggestion than mine.
However, the cleansing step is mandatory (at least for me).
I like the Meguiar's #39 heavy duty cleaner for this task, but many uses 'just' an APC and that's ok. For APC, I got great success with CG All Clean Citrus+ (maybe not exactly named on this order, lol) on trim, but again, #39 is hands up and down my to-go for trim cleansing.
Take a look at my thread on Civic, I've showed the process I recommended above.
If you notice, some even asked what kind of trim / rubber treatment I've made.
The answer: Just cleansing. The coating will not add (if just little) difference on trim looks, but it'll add protection and it'll be easy to clean on conventional wash going back to best condition, and bead water like paint coated surface.
Here we go,
http://www.autogeekonline.net/forum...-full-detail-pbl-coating-coating-booster.html
Pics are down there after the polishing step, prior coating.
You may also use any trim protectant suggested after the cleansing stage. It'll also last more and look better when applied on a clean surface.
Please, feel free to ask if you need any further info.
Kind Regards.