We need to have the liner in my brick chimney replaced, but it won't budge. We've had a chimney company come out and try for 3 hours, including using the drill tool that bangs around the inside thinking it would rattle it loose. They used a portland/vermiculite mix around it. Any suggestions on getting it out? Some suggest a liquid to react to the mix. Would creosote play a part in binding the liner and cement?