We had a roof leak around the air horns, finally scrapped off all the old caulking and used Eternabond, no more leaks. To answer your question, the fabric ceiling stained a brown color, probably from the glue and wood. We used OxyClean and sprayed it good and blotted it with a clean rag. Did that a few times, then sprayed it again and set up a blotting rag with a support to keep it against the ceiling overnight. It worked well for us.