I've tried to tell him to let the tank get pretty close to empty and siphon whats left out. He's a stubborn person and thinks that adding this would get it all out. Well it looks like his thought failed him again....
One other concern that may persuade your friend to remove the tank to be sure all the water is out is, Iso propyl alcohol at some concentration will eat the neoprene fuel lines, fuel pump diaphragm and any orings in the system. What that concentration is I don't know but sometimes ya gotto scare people into doing the right thing.
