Clonex Clonex
Full instructions and guidelines are provided with each pack, but the basics are:

Take your shoot, stem or leaf cuttings from actively growing plants, without flowers, and immediately dip the base of each cutting into Clonex to a depth of 10-20mm, then place cutting in medium.

Great for quick rooting of cuttings.

Just dip the stem of your cutting into the gel and you're done.

Used by professionals, loved by all.