whats this part called on a v6 engine??
If you are going to paint the cam covers, you can unbolt the pipe's base from the cam cover to avoid having to remove the clic-r fitting.
If you intend to reuse the clic-r clips, buy a pair of clic-r pliers.
I painted my cam covers and other bits last summer in Hammerite smooth using their special metals primer (for aluminium and galvanised metals). The results are good and the paint is still well adhered after a year. Only area with some wear showing is the oil filler cap area. I recoated it recently after using degreaser, alcohol and fairy liquid. The new coat is not wearing away yet.
Good trick to get the last of the grime off is to run it through the dishwasher, followed by a going over with a stuff bristled brush in warm fairy liquid solution for the last of the grime and oily muck.