I have three kitchen doors where the corner mouldings are separating. I don't really want to put nails into the wood. The foors are real wood and the nails may spoil the look of them. Is there anything else I can do to get the corners to stick together? What can I do to remove the existing glue as someone has already tried to push the corners together and I think this glue may need to come out so any fix will work better?