This is the best way I've found to clean the "hook" side of hook and loop tape (Velcro) that has collected lint and strings due to having gone thru the wash unattached to the "loop" side. This happens to baby bibs in our house all the time. Shoes with Velcro closures also tend to collect fuzz, and this works on them, too.
Use a seam ripper. That is all.