Hiya. Pardon me saying but those are nice tips!
On a serious note do you tend to keep on top of the polishing of them? I've got a mk5 with 83k. The tips are black and lumpy. Seeing yours makes me think I can maybe bring them back from the dead.
Sorry for the slow reply. Anyways, thank you for your compliment! : )
Yeah basically if you want to keep your tips looking good they will need some extra attention after each wash, but it's only a minute's job each time anyway. Like lukemk5gti said above, you want to have a separate sponge or brush for the really dirty work and some powerful degreaser to go with it.
If yours are in really bad shape to start with, you definitely need the wire wool and metal polishing paste for bringing the back alive again. But make sure to buy the really fine grade of wire wool that is either the #000 or #0000 as coarse ones might leave permanent damage to the chrome coating. As a matter of fact, regular use of any wire wool is something you want to avoid on exhaust tips as it will eventually wear down the shiny coating on them.
I don't how bad yours are but I wouldn't say the process of salvaging the tips should take longer than 15 minutes with proper gear. Good luck! : )