Hi Imran
I have a 1997 80 cabriolet which has alloy trim around the wind screen and along the side and round the roof compartment, it was badly tarnished when I bought it and I tried everything to remove it including commercial tarnish remover, it didn’t work! I eventually tried a woodturners wax that contains a very minute amount of very fine grit in it, it worked wonders at removing the tarnish and brought the trim back almost like new. I applied it by wrapping a clean cloth round my index finger, picking up some wax and working it in small circular movements, leaving it for a few minutes then buffing it, not only did it remove 95% of the tarnish but also left a protective coat on the alloy to prevent it from tarnishing again. I have attached a pic of the wax i used, it should be available on EBay or you could try any of the woodturners supplies sites. If you don’t want to go to the trouble of hunting this brand down you could look for an alternative wax but just be careful of its abrasive content, the wax I used worked very well and you wouldn’t want to use an abrasive wax that would damage the finish. The wax I used is called “U Beaut” EEE-Ultra Shine.
‘Hope this helps!
Turlough.