It looks nice and shiny to me. A really good finish, but it looks a bit labour intensive. Myself, being an idle git, I use a waterless car cleaner. £9-ish for a spray bottle and I think I also got a couple of microfibre cloths with it.
Spray it on, over all of the muck. Wipe it (remembering to keep turning the cloth.) Polish it off. A Z3 will take about 5 minutes to be totally cleaned, polished and protected. Once the car has been done, sprayed on graffiti can be removed with a second spray of cleaner. (So the demonstration said.)
What to do with the saved time? Drive the car and get it dirty again.