I use ammonia in a 25% solution. It really helped with the slugs in the areas that I sprayed early. I did still have some scattered nems. Not sure if they are related.

I used ammonia in the spring when the pips were about half inch up. Just drenched each one. I had very little slug damage this year, but I also had zillions of toads for some reason. The toads have all disappeared in the last month and the mosquitos are having their last hurrah. At least I haven't seen any ticks on me this fall. Who knows what causes what? I realize every time I weed a bed I'm changing a small ecosystem. I think I'm going to opt for a green burial when I die and let the bugs have their way with the body I will no longer inhabit.