It's like Autoglym. The dealer offers it to you buyers, giving you the usual spiel about how it can make your car look fantastic for a decade or more and solve world hunger. When the time comes, some youth at the dealership will slap it on willy-nilly in the dealer's compound with a large brush in five minutes whilst having a smoke and texting their mates. (Yes, I'm cynical.)
You don't have to have any treatment applied at all, but they will try the hard sell with you, like they would with paint protection, tyre protection, gap cover and the like.
You can prevent the same thing happening to you by declining the dealer's suggestion that you get any sort of treatment at all applied to the car by them. There are a number of threads on here where people have opted for a professional detailer to do the job instead and have been very pleased with the results.
If you've spent £25K+ on a GTD or a GTI, and had to wait six months or more for it to turn up, you owe it to the car (and yourself) to treat it properly from the very beginning. Get the dealer to remove any stickers and protective sheeting and give the car a quick hose down, but after that, the professional detailer takes over. Making cars look fantastic is their bread and butter.
