I've taken more than 150,000 clones professionally, and we have done it so many ways.
The most effective: Cutting a clone off and sticking it directly into pre-moistened soilless mix without any additive whatsoever.
Second most: Cutting clones and dipping in Indole butyric acid (IBA) and Napthyl acetic acid (NAA) solution for 5 seconds, in plugs in soilless mix.
Third most effective: Clonex Gel dips into any medium hydroponic or otherwise.
Least effective: White willow bark "tea" and dipping clones longer than 7 seconds in IBA/NAA.
The hardcore determination on vigor appears to be cutting your leaves down to nothing and keeping humidity high while letting mother nature do her thing unimpeded. It is best to cut, cram into some soil, crank the humidity high and temp warm, and do what you can to eliminate Damping Off. Do that and you have 96%+ clone success rate.