my keurig experience: wife insisted i clean machine.
run tank of 50/50 white vinegar and water thru machine.
run tank of rinse water thru machine.
now machine makes only 1/2 cup cause the crap the vinegar loosened now clogs the hypo piercing needle,
which pokes a hole in the top of the k cup
coffee now tastes worse than crap, and only a 1/2 cup
ran another 50/50 solution thru machine, cleaning the 3 orifice holes in discharge piercing needle each cycle with paper clip
poke each orifice each cycle
rinse using a whole tank (cup size is low each time after pulling/ replacing tank, it improves)
made a great cup of coffee but tossed half of it cause its time for a beer