m0useanswered grow question 2y ago I agree with others saying flushing is a myth. Its just not needed. FLUSH as in buckets and buckets of water all at once.
I do follow the same process as Organoman suggested, I stop giving nutrients and use only PH'd water for the end bit of my plants life but I also grow with dry amendments I mix into the soil. So its a bit different then using liquid nutrients.If liquid I would tapper the feeds off 2nd last week and then little to none end week so your not wasting the nutrients.
I would bet it was a bad cure but it smells more like cat piss ammonia. and if it is not vented out and allowed to dry more it can destroy the quality of the buds. If they where over dried they have little to no smell mostly.
Good Luck!