| Thank you clembo. Your reply cleared everything up for me. I have been hoarding old US coins since the 50's. It is only in the last few weeks that I have started organizing everything. I had researched proper ways to store coins correctly and literally every article said do not clean!! I was delighted to find a dealer that told me that cleaning was OK as long as I used their product and then only nickel and copper. Fortunately, I only cleaned about 20 coins before joining CT and asking one more time. I have placed well over 2000 coins in 2X2’s. I would have cleaned everyone of them thinking it was the correct thing to do. You and everyone else on CT did indeed do me a great favor. | 
