Good questions Ralph. I too would be interested in a podcast/thread like this. I always wash my hands and rinse them well before sticking them in my tank.
Our family has used Shaklee non-toxic cleaners for years. You dilute a concentrate in H2O and use a trigger bottle to spray them. Even so, in the room with my tank I spray them into a rag rather than onto whatever I am cleaning.
I don't have any evidence to back this up but,
IMO if you are using anything that has the "use in a well ventilated room" warning in the area of your tank you may want to cover it with plastic and turn off the pumps until the smell is gone.
Carmie