To be safe, don't use soap or place the floss bag anywhere near where it can get soap on it. Best treatment is to wash it in the washing machine with chlorine bleach. A good rinse in the machine is good enough. It's not even necessary to let it dry.
Definitely let the skimmer do it's job then scoop out and dump the soapy bubbles as often as needed.
You are lucky it wasn't enough to kill anything. There have been horror stories.

Edited by Mark Peterson - December 18 2009 at 11:56pm