My Mother took her 1970s Kenmore to a large Sewing Machine dealer (local to Portland, they advertise a lot on the radio) for a servicing. This was before I go into vintage machines and started doing my own. They must have used the OPs spray method, because two years later it stopped, frozen solid. I took her my older Kenmore (My Dad was a Sears Man, and bought both of them) and I brought hers home. When I opened it up, I could still see the spray pattern, and the sticky, whitish residue. I had to use PB Blaster to get it freed up, then clean it and oiled it with Tri-Flow. I will never let her take it to someone else again. And I tell everyone I can not to patronize these guys!