Our below-grade family room cinder block allowed water to seep thru. I didn't know it for a long time. The moisture had built up behind the wood paneling and actually "ran" along the baseboard and carpeting up against the 20' long wall. I ended up ripping all of the paneling down and tearing up a wide strip of carpeting to remove the mold. 2 nice homebuilt bookcases with panel doors had nasty mold on the bottom edge and underside, and water stains that ran up the sides a few inches. The wall has been water-sealed and new paneling installed. New carpeting for the entire room is on the way.
The question is what to do with the bookcases (tossing is not the preferred option!). I turned the cases upside down and used a lightly damp rag with Lysol liquid to kill the mold, dried with a towel, repeated, let the wood dry out, then used some Lysol spray. I realize I can't make the stains disappear, but I want to make sure the mold is dead for good so I don't stain brand new carpeting or have the mold "grow" up the bookcase.
Should I seal it with polyurethane? Leave it alone?