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I am doing the same thing with some dry rock. I have a piece that broke up which had some sponges, and some stuff on it. I can even smell the dead items coming off the dried rock. I aquacaped the items with epoxy and let them dry cure. Basically what my plan is cure the dry rock in a square tub...
sorry i didnt read the thread....i have never dealt with an gas furnace...sorry about that
i do have a contractor that services mine and he he's really inexpensive
do you have a Gas or Oil furnace?
you can try this i have picked up some tips in the past....there is a series of videos on this channel
Introduction to Grayfurnaceman's channel - YouTube
here are some recent picture I took in Jan/Feb of this year (these were done with a cell phone so please excuse the glare)
and that's about it....thanx guys ....any comment/advice are greatly appreciated