Hello, my grandfather left us a coin collection he was collecting for his whole life. Mostly of the coins are silver WW2 German coins (1933-1945) as well as coins from Weimar Republic. There are other coins as well, probably more than 1000 of them. I have no intention of selling or expanding the collection right now. Instead, I would like to preserve it as best as possible and learn more about them. My hobby is watchmaking for now, and I was able to see how easily the metals could deteriorate. If I understood correctly, the coins should not be cleaned at all. I am not sure, but I think that my father cleaned some coins by rubbing dry baking soda on them few years ago. Did that reduced their value? On the other side, I would like to handle them all using the gloves to reduce the acid on my fingers getting to the coins and protect them. However, not sure what would be the best option? Should I buy plastic coin sleeves? I heard they are not that good since PVC could leak onto the coins. Since there a lot of mostly identical coins, should I put them in coin tubes, although they could rub on each other? Is the insulation from air the most important thing? A lot of questions, but I hope you will be able to help me. Thanks in advance.