Enough to cover it in water, i use ~1.5 tsp per quart hot water, stirred in & mixed welI. Let sit for 10 minutes, drain, rinse & repeat. 1-2X more & it sparkles w/ zero residue.
If I can use an ultrasonic cleaner, it cuts that down to 2-3 cycles of 8 minutes with the same PBW ratio, just a...