My featherweight came with the worst musty smell you can imagine. I took a paper bag cut the top off filled it with charcoal, not the kind with lighter fluid in it, enough that I could stick it down inside the case between the machine and wall of the case ,stuck in two sheets of bounce dryer sheets and closed it up. The smell is almost gone. I have changed the charcoal and dryer sheets a couple of times but when not in use I just put the charcoal and dryer sheets back in an leave it until the next time I use my featherweight. My DDIL use this method when she had a musty smelling her basement so it was worth a try, I had already tried fabreeze, outside in the sunshine, washing with just about anything I could think of that wouldn't hurt the finish. Worked for me hope it works for you.