I cut small squares of old tee shirts (about 2") and wrap them around the end of an orange stick or stilleto or screw driver. The lint will stick to the tee shirt. Qtips can leave behind lint . Also use canned air on the bobbin case after removing it . I do
take the corner of a business card and run it under the spring
of the bobbin case GENTLY as lint will build up there as well.
especially on my embroidery machine. I did repairs in a LQS
on Bernina's and this is what we used there.