I use a "curry glove" that is not dissimilar to the hound glove above. Curry gloves are designed for horses and sold at equestrian supply places. They made of rubber (avoid plastic versions) and have short nibs on both sides that effectively loosen hairs that are soon to shed.
Curry gloves are very inexpensive and work great.
To finish the job, I use a horse brush to sweep away the loose hair.
These equestrian tools are perfect for Vizslas IMO.