It pays to give those details the attention they deserve.
The most important thing to note about the Porsche in this video is that, at the beginning, it looks pretty decent. Considering the age of the 1989 911 C4, it has obviously been pretty well looked after, and that's what makes it such a good car for this demonstration. What we're seeing is a real, proper restoration-type cleaning, where the parts that don't normally get cleaned, parts nobody usually even thinks about, get some real attention.
The paint and plastic get some additional special treatment as well, and the end result is far more dramatic than you might have thought possible at the beginning.