Draino

There are several important ways in which what we do differs radically from others who do workshops on communication or psychotherapy. When we first started in the field, we would watch brilliant people do interesting things and then afterwards they would tell various particular metaphors that they called theorizing. They would tell stories about millions of holes, or about plumbing: that you have to understand that people are just a circle with pipes coming from every direction, and all you need is Draino or something like that. Most of those metaphors weren't very useful in helping people learn specifically what to do or how to do it.

Hello,

The above is from the first paragraphy of the first chapter in a book named Frogs into Princes by Richard Bandler and John Grinder. Could anyone answer the following questions?

1. They would tell stories about millions of holes, or about plumbing:

What do "hole" and "plumbing" refer to? I know what they literally mean. I mean if there are any meanings that are beyond the face values of them.

2. people are just a circle with pipes coming from every direction

I would interpret that people come out from different purposes, backgrounds. A circle with pipes is a metaphor, correct?

3. What does "Draino" refer to?

Thanks!