We shall proceed with a picture:
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As you can see, the brows and forehead have these greenish stains on them... Just bought this new and according to the seller, the cap was like this when he received it from the source (Clickclack).
Is this typical to these skull keys, any ideas how to go about cleaning it? The first idea was to try some alcohol on it, but then again this cap came with a substantial enough pricetag for me to proceed with caution.
Thanks for any help/ideas that shall (hopefully) be forthcoming.