*still works as of July 20th 2022*
the easiest way by far is to farm the
LAST MISSION BASED WALLas the other guides state once you
finish the game and are back in the
main menu simply choose to
continue. you will be back at the
checkpoint before the last wall.
now, this is really easy. on the other side of the area with the plague wall, there is a
AWNING (front of "olde something laundromat") you can jump to
FROM A WELL PLACED CAR and lob over grenades and
MOLOTOVS.
thats it, bring lots of each plague grenades and molotovs, make a outpost nearby (mine was at the "stinky red house").
Edit 2022: you can now request for locations of plague bloaters to harvest from the radio for 35 influence. there is always 3 bloaters at these locations. easy to farm them for plague busters, however they are usually close together be careful not to explode one while extracting the other. my method was farm the 3 bloaters go back to my truck parked a small ways away, jump on top of it to wait out the radio timer, call in the favor again, and it would be in the same exact spot, repeat.
Molotovs just take fuel resources and can be crafted, I was crafting them at the outlaw chem lab for 2 fuel and 30 "bolts" for 9 Molotovs.
I was averaging about 25-30 Molotovs and 6 plague busters per wall to kill it.
below will be clips of me farming bloaters, and me throwing Molotovs and plague busters over the wall.