How to clean out the white ink?

I have recently acquired a Sawgrass Advantage DTG printer. If I can make it work I will pay for it, if not then I give it back.
The problem is that the seller has had the printer sitting in his office for about 6 months and he hasnt used it. The white ink is still in place and hasnt been cleaned out and now its all dried up. There are not instructions with it either.
Can anybody point me to a link that will explain how to clean the ink out of the system. I cannot find the info on the Sawgrass site. I dont care whos link it is , I just need some idea of where to start.
Hope someone can help.
Earl

Location: 
United States