How do I clean the outside of my flute?

So I have these weird tan/gray color on my flute. They are specifically where my lips go and where my fingers go. Does anyone know why they are there and how I can get rid of them? I got this flute years ago and forget what it looked like before so I don’t know if it’s my fault it’s like this or if it’s just the... show more So I have these weird tan/gray color on my flute. They are specifically where my lips go and where my fingers go. Does anyone know why they are there and how I can get rid of them? I got this flute years ago and forget what it looked like before so I don’t know if it’s my fault it’s like this or if it’s just the design, my other flute friends do not have the same problem on their flutes.
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