Bests & Worsts Reviews from Amazon

Not sure who is to blame here....I got this product to clean my Kennedy 50 cent coins and Ike dollars and it cleaned the coins very well and after a few days I went back to look in my coin tubes, to my shock and horror, the coins are discolored and tarnished....not sure what happened. Now my huge collection of 50 cent pieces and Ike dollars are ruined. I'm very disappointed at myself. I should know better than to clean coins and should have left them alone. Here is a pic of how some of them look....