I'm pretty sure this 127 would classify as an extreme case. YUCK. I'm about 80± % finished cleaning it. I'm going to borrow the top tension spring off of my 66-1 and test sew with it today. Depending on how that works will decide it's fate.
The idea of running it through a car wash using the high pressure wand intrigues me. ( Do we have a devil icon here?)
Joe