I put a stamp on a stamp block that came with the Silhouette stamping starter kit - on the side with the white guide lines. When I cleaned the stamp and block with Isocol it started taking the Silhouette logo and lines off!! I pulled the stamp off and cleaned it separately and cleaned the rest of the block very carefully. Next time I will use the other side.
Isocol, an alcohol antiseptic, makes a great stamp cleaner and is cheaper than buying special stamp cleaner in little bottles. It even cleans up STAZON. And you can get it at supermarkets.