I recently acquired a set of copper bottomed Revere Ware (4 pans and 4 lids). We can’t use the copper bottom pans on our stove so we’re giving them to a friends Daughter. I spent a little over 2 hours cleaning them up. I was beginning to think elbow grease wasn’t going to be enough and would have to get out a power tool. We had these exact pans at one time and I would use Cameo copper cleaner but our local store didn’t have any so I purchased and used Bar Keepers Friend instead. Can’t say if it’s any better or worse.