A resident quit shop owner came with a few machine maintenance recommendations on our last guild meeting, and one was new to me – floss your machine.
Take a piece of thick cotton thread or thin yarn and thread your machine as usual all the way to the needle. Now floss – pull it back and forth a few times to release any dust.
I cannot really say whether it made any difference or not, but it makes sense to clean more than the bobbin case – which I do rather often by the way.
Do you floss your machine?