carbitol is just an extra ingredient in a good homemade mix of cleaning solution for the JV3. artbot's posted a good recipe that also includes mostly butyl celusolve and acetone, with the carbitol being a slight addition.
I get all my ingredients from a local chemist, but Sherwin Williams should carry it all too.
This stuff works great! I fine that adding a little more Acetone cuts the dried ink better. Have jets firing a fine line of fluid now on all 8 jets. Did it all while in printer. Also... changed cap at docking station.