Indy, I have used Poop Off for years with no side effects for the birds. I understand there are others now don't have a scent. I have never understood why they put scent in it in the first place. Probably because this world is so scent oriented. Maybe because we'd think it was water if they didn't make it smell pretty.
I also use Oxyfresh Cleansing Gele (NOT OxyClean) on a wet rag and it cleans as well and as fast as Poop Off. It is so mild it is made for human bathing. This stuff is sold by individuals but I gave up and called the company to order it. High dollar stuff but you only need a drop or two on a wet rag. I don't even rinse because it is non toxic and it leaves the cage shiny with no soap scum.
I have black toenail dogs, too, but I don't cut them nearly as short as the vet. They almost always nick one or two. I have to use tiny human clippers on NaeNae Chihuahua because her toenails curl under if I am a day or so too long in doing them. Very hard to get around the toe pad with any instrument.
We call it "hanging the dogs", because hubby has to hold them up in the air so they can't fight. Ohhh, how they hate having toesies messed with.
Annie