I carefully wiped the mold with wet paper towels and quickly dropped them in the waste basket. I repeated this a couple of times. Then I took damp paper towels again and added bleach and wiped down the bottom and insides of the case. Then I put the waste basket bag into our trash can outside. There is a musty odor in the case and machine, which can be "normal" for an old machine. The smell comes from where it has been stored and also the old oil pad in the bottom of the machine, which I've already disposed of. I'm hoping the bleach treatment reduces the odor, and I have some special case deodorizer from The Featherweight Shop on the way to also attack the smell.
Now the fun begins: I get to rub the Kiwi black shoe polish onto the outside of the case and make it look beautiful! It's fun: I used to polish my dad's shoes when I was a kid (besides mine) so it's nostalgic for me, soothing, too. I enjoy seeing a pair of shoes cleaned and shined, back to their original beauty. It's the same with the case.