there are different types of paper backed fusable. some say ... permentent bond, no-sew fusable...these will gum up your needles, whether is it wonder under, heat n bond or steam a seam. if you want to stitch your fused fabrics you need to purchase the products used for sewing, they usually state on the packaging or end of the bolt if it is good for sewing or if it is considered a permentent bond.
a small soft cloth saturated with olive oil (or machine oil) beside the machine will come in handy to clean the gunk from your needle as is builds up but extra cleaning should be done on the machine after so get rid of the gunk that sticks to the lint and builds up under the bobbin.