Hook and Loop Fastener consist of two components: typically, two lineal fabric strips (or, alternatively, round "dots" or squares) which are attached (sewn or otherwise adhered) to the opposing surfaces to be fastened. The first component features tiny hooks, the second features smaller loops. When the two are pressed together the hooks catch in the loops and the two pieces fasten or bind temporarily. When separated, by pulling or peeling the two surfaces apart, the strips make a distinctive "ripping" sound.
The hook side of the fastener has a strong affinity for the fuzzy loop side. Unfortunately, that affinity also attracts a range of items. Over time, the hooks can collect lint, string, hair and other unsightly debris. The best technique for cleaning large sections of hook and loop is to comb the debris out from the hooks. There are many objects suitable for combing hook and loop including pins, needles, seam rippers, staples, hairbrushes etc.
Please note: when washing garments with Velcro fastenings, which are not closed together, any parts of the laundry may be damaged. Very easy to damage especially products made of yearn.