Fur Out Of Velcro. Scrub the velcro strip with a toothbrush. 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.
Scrubbing the velcro with a nail brush and some soap can work to loosen and remove the lint. Velcro was the creation of swiss engineer georges de mestral, who had been inspired by a walk in the woods with his dog in 1941. His fur gets into one side of the velcro (the scratchier side.) i've tried washing and drying the harness.