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I've already found it and you can't guess what they call it... Neatsfoot oil, I guess there is no Swedish name for it!

Roger Wilco on that!

I can also recommend Micro-Mesh for polishing, it does wonders for the scales.
Whatever you use don't use use any paste on it, horns and bones got pores that will fill up...

I've never tried neatsfoot oil, have to buy some, if I can find it in Sweden!
But I'm sure it's perfect for scales!

The old classic goldsmiths way is to use ears wax or rub it in your hair, that gives it the natural waxes and oils it wants.
But otherwise use a nice oil like camellia oil or any mineral oil, you...