Thanks for the encouragement. I don't plan to document each step here, but I will show some highlights as I go. Today I started taking it apart and cleaning the bits and pieces. I used the ultrasonic cleaner with a 50% solution of Simple Green. I must admit that I was very pleased with the results. Here are two examples. The bobbin winder frame and the tension discs. The bobbin winder went through three 8 minute cycles and the tension discs had one 8 minute cycle. I'd say it removed 90-95% of the dried oil and grime. What remained was softened and easily removed with a toothpick or Q-tip.