Under bonnet clean on mine. Not that it's really been anywhere to get dirty but it was starting to look a bit jaded so it was out with the Aerospace 303 for the plastics and Gyeon QD for the paintwork. The C-Tek lives there by the way, been there a while now and not going anywhere for a while unfortunately.
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Only just started with the Gyeon on a suggestion from the helpful folk at
CleanYourCar and I must admit to being impressed with it so far. It's recommended for ceramic coatings, which this one has, and also good on the other stuff I've tried it on so far.