Hello I have a Mercedes GLA 200 in cavasinth blue. So far I have not noticed a flight rust (only small white points, which is probably not a flight rust). On this dark varnish flight rust is probably quite difficult to recognize. What does flight rust look like on dark varnish or how do you recognize it? If there is a flight rust, then Sonax flight rust remover is ok or maybe still Koch Chemie Koch Chemie ReactiveRustRemover? Are a microfiber cloth or Rei or does it need, for example, a Sonax Clay ball?