Yein - der Gestank
verflüchtet sehr schnell und die Wirkung ist enorm.
Wir haben ja große Mengen Amonniak im Fensterputzmittel und manch andere Haushaltsreiniger, unangehnem steckend, ja - aber nur kurz anhaltend.
The fumes from the ammonia do a fantastic job of loosening the baked on dirt and they are gone very quickly once things are clean. You can re-use the ammonia left in the bowl in the morning for the cleaning. I would wear eye-protection and rubber gloves but the risk of burning yourself or damaging kitchen surfaces is much lower than with lye.
Do give the bags a try sometime, I think you will be surprised how well they work.
My last full-size oven here in Germany was a deluxe built-in 60cm with self-cleaning. The vent pipe out of the oven went through a catalytic scrubber and filter before exiting into the room. Yes, it was a very expensive oven, top of the line from Siemens.
I used the self-cleaning function every month (shared a really big apartment with a friend and his girl-friend for two years until they found a place of their own. Munich in those days still had a housing shortage). According to the instruction manual, the enormous amount of insulation made up for the extra cost of cleaning - and was still cheaper than using a commercial, caustic product.
Beats me - it worked great.
I never again want a self-cleaning oven without that catalytic scrubber. To be honest, tho' - since I've started using oven bags and putting drip trays under pies and other bound-to-drip stuff, my ovens just don't get that icky dirty that they can't be cleaned with normal household cleaner after every use.
That's the key, really - you have to clean them every time they get dirty.