So I was lucky enough to get a few pieces of my mothers copper cookware that she bought many many moons ago. Half of it is stamped Made in France, the other half is stamped Waldow Brooklyn, NY, although they look like they came from the same manufacturer. It is wonderful cookware! I just began to clean it after decades of neglect :( The outside was a snap, Barkeepers friend worked miraculously! It's nice and shiny again. But I wasn't sure how to clean the inside with the tin lining. I didnt dare use BKF on it. It says nothing about tin on the can. So my question is what should I use and how should I clean the tin lined inside of the pieces I have? I am not used to copper cookware. The few brands I have seen today are mostly lined with SS not tin. So I have no idea really how to care for these pieces on the inside. I would appreciate any wisdom on this matter.