Hi Constantin,
I like the look of the VRX 400 too!
These winkers are mainly aluminium so you put the Belgom ALU polish on a cloth and rub hard till is shines. The year after you have to repeat :-(
Any minor rust on chrome you can polish out too, maybe start with emery paper. This is very fine sanding paper. If the chrome is pitted or you managed to sand through the thin chrome layer you got to a layer of unprotected metal which you will have to get re-coated with chrome or keep protected with ACF-50. If you don't the rust will come back and attack with a vengeance! The tinware on this bike is not very well chromed and I ended up replacing all the main chrome components (fenders, tail light bracket, exhausts).
Hope this helps.