German paint...is that on a German car? A German car that is built here, or in Germany? Paint is paint but some mfrs. use nanotech paints that are harder, and some mfrs. paint is just generally harder than others. Perhaps you could elaborate a bit more on what your situation and what your goals or challenges are.
Audi's have hard paint. You'll probably have the easiest time using a polish which has abrasives that are designed for the Ceramiclear-type paints, or with similar hard abrasives. That would be the Wolfgang swirl remover, some of the Menzernas, and Meguiar's 105/205.