Hi!
This is a vintage lambskin bag with some grease stain, abrasion, etc.
I wonder if you can give advice on the sequence of steps of restoring it, thank you very much!

The main concerns here are patches on the flap that seems matte, rough, and darker colored than the other parts of the bag (see pictures below).

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The edges of the bag also look darker and greasy due to abrasion during wear (see pictures below).
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Thanks a lot!