Stamping On Tiles

[pokeyspiece]

I know this has been an on going discussion, but I have bought some 2 x2 tiles and I can't get the cement off the back of them. What should I use to get it off. I am frustrated please help me. I wanted to give this as an office gift out to my coworkers (30) and I all I ever talk about is stamping so can you image if my work doesn't look good. Please send me an pm at [email protected] so it does not clog the system.
Thanks Tai

[CarolDNC]

Can I ask why you need to take the cement off the back? I've been making magnets for Christmas and haven't done anything to the back except attaching the magnet.