I clean the coro by "flashing with a propane torch, then I clean it off with alchohol, using CA only use a small drop every 1/4" or so, if you use to much it makes a mess and does not set up worth a darn. Practice the flashing on a piece of scrap, takes a little getting use to, you just want to burn off the release agents (oils?) off the plastic, if it warps slightly wait for it to cool down and it should go back to its origional shape.
John