Cloudy Ammonia stain on terracotta tiles

It’s probably reacted with the polish on the floor – most floor polishes are ammonia based. Luckily it’s easily removed. Go into the cleaning aisle at Bunnings and look for a “Long Life” brand polish stripper. I forget what it’s called (yellow plastic packaging), but its job is to strip ammonia based polishes before you reapply the polish. You might as well buy the same brand of polish and repolish it afterwards.