I had a bucket of pennies the other day and they were sticky with soda etc from the car and i needed to roll them to take them to the bank so i brought them into the house and into the bathroom there i grabbed a bottle of my favorite bathroom cleaner The Works Toilet Bowl cleaner and poured this into a plastic dish where the pennies were and shook them around and let them soak fer a bit all of a sudden they were shiny brand new pennies like they had just came out of a mint so i rinsed them off and rolled them up just like new. Thats a remedy i never thought would work but came out with great results