I had a very musty smelling case and machine. I tried everything to no avail so I took 2 glade decor scent refills took the cover off and put them in the case closed it up and left it for 6 months. My Bernina had a problem and went to the fix it shop while I was piecing a big quilt so I brought out my FW and no musty smell. It does smell like lavender and vanilla but that is much better then musty.