I did some blushes today, including my Spring Color forecast Azalea Blossom (! I know, but I'm moving and I need everything in palettes). I used a syringe full of rubbing alcohol and a thin knife: I slid the knife down the side of the pan between the metal and the plastic (not enough to bend the metal pan!) and dripped alcohol down the blade of the knife; this will cause it to run into the space between the metal and plastic. (If you just pour alcohol on the edge of the pan, it will run into the blush and not underneath the metal pan, which is where you want it to go.) I let it sit for a couple minutes, then repeated...as the alcohol gets further under the metal, it can dissolve more of the glue and the pan gets looser. It took a little time but I got everything out without damaging the plastic or the metal (although i got a tiny chip in the side of one of my blushes). Pleased with the results.