Musty/Moldy smell on old knotty pine walls and ceiling
Howdy folks. I need some cleaning/de-smelling tips for our 1955 Florida ranch house. The house was a fixer when we bought it (8 years ago) and had been sitting sealed up (unoccupied) with no air condition running for 7-9 months (including the hot summer months) prior to us buying it. It smelled pretty bad. Before moving in we scrubbed everything thoroughly, "Kilz" primed (and then painted) all the walls AND ceilings (most of them with multiple coats). We had the parquet wood floors refinished. The roof and AC have also been replaced. BUT...to this day...there is STILL a moldy/musty smell that permeates the house quite often (particularly during the hot summer months). It comes from our den (and only from there). The den has this old knotty pine tongue & groove hard paneling on the upper third of the walls AND the ceiling. It is stained a lovely warm brown mahogany color that suits the room well. We have scrubbed repeatedly with soap and water (as well as Murphy's Oil soap and even a few other things) and it STILL smells musty/moldy (ESPECIALLY when it is 90+ degrees outside..as the outside roof of the den is fairly flat has direct sun exposure). Some days it is quite strong and my sinuses get quite aggitated. I really don't want to rip it down or paint over it (if at all possible). Any thoughts on how to THOROUGHLY clean it and get rid of the smell (without severely damaging the finish)? There has not been any water damage or leaks of any kind in the house or through the roof. It just smells like really musty old wood. Any hard-core cleaning tips appreciated. Cheers.