First of all: Do you know the difference between ammonia and acetone?
Second of all: Search. There is a thread called something like “low carb and ammonia smell” (turned out to be mostly acetone, but some ammonia cases) and there’s another one here:
in which a guy got rid of his ammonia smell by supplementing with citrulline (very simply put: ammonia scavenger).
Hop I was of help!