It used to be inside naxx. The trash before Heigan can be farmed for stacks of frostweave. I think the routine was to set naxx to 25 player, clear upto (not beyond) Heigan, move out, reset and set to 10 player. From that point on, keep farming the trash packs before Heigan. *edit* was browsing the forums for ideas and found the original profile i was talking about.... https://www.thebuddyforum.com/honor...ming/162802-endless-naxx-frostweave-farm.html Maybe it needs some tweaking...
I used to the PIT on my druid when i needed cloth...mount up aggro about 40-50 mobs on your mount and then aoe them down. You get tons but you can only do about 10 min of each hour.