The porch trim assembly was put together using Titebond II Premium. A mixture of equal amounts of water, vinegar, and acetone dissolved the glue without damaging the wood.. Just put a little bit along the joint. Let it sit for about 10 minutes, and then scrape the glue with a very thin object like one of those screwdrivers used to tighten the screws in a pair of eyeglasses, and gently pull the soffit out of the assembly.