Well, if that hazy look you got after I responded, I feel badly about that.
If what you were removing from the back was a stuck bit of rubber band, then you could maybe put a bit of a nonpolar solvent on the end of a Q-Tip and gently rub to see if it loosened. If you put water only on the back, it will soak through to the coating on the front and cause or exacerbate the haze problem.
Did that Davis card look like that when you got it?
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