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Ask how I know ;) I'd clean the whole area of the sensor at least a couple of cm around and the spot pick up.
@TRA am just talking, I have cars with grease nipples still. To me a thourgh service is a replacement of all consumable liquids and filters. Checking the bits that wear and things like engine and suspension mounts. Sort of have an idea how the bits are.
With a prince engine, regular camchain changes and tensioner ...but the bore wear shouldn't be an issue with regular oil changes and never letting the oil go low.
Ah, Yep, forgot that, I think the camshaft sensor relies on a magnet that doesn't work too well if covered in crud.