Thanks Dan. They are not chromed buddy, just plain alloy. When I got them, the original plastic coating they are wrapped in was still partially applied to them, which is where the water has got to on the one of them.
I hate polishing items that do not require it and prefer to have original finish items over anything else so I wouldn't even think of getting them polished out. I would just like to know if it is okay to leave as is without worrying of any further damage occurring.
I did use a little alloy polish on a rag to just go over them lightly, very lightly to be honest with you, and the mark is stained on the surface. There is no 'eating' of the alloy present at all