That mixing bleach and ammonia is NOT a good idea. You create hydrochloric acid and chloramine gas. Honestly, some people need t go ack to high school.
I had to remind my SO of that, and he has like a master in micro biology/chemistry type of things but had never thought about the day to day applications of that, and that as two male roomates they might want to (clean the dingdangity toilet because it reeked and) be carefull with using the product they had on hand (curious I had a look at what they used before saying something).
He knew of the chemical reaction but didn't think it mattered/there wasn't enough a ammonia 'produced' to matter.
It's gotten better at least, not perfect but better. I occasionaly pour some product on and around the bowl, let it sit while I brush my teeths and rinse (without scrubing, I know it won't help much, but they have one of those toilet hose (previous tennant probably cloth diapered) that pack quite some pressure and that helps smell wise).
people who don't clean their restroom even tho they often have guests..