I like to soak my rock wool cubes in a mix of flowering nutes,just a small ammount i use advanced sensi bloom about 1 ml per litre and a drop of superthrive per litre.Leave the cubes in the mix for a couple of hours then squeeze out the excess water, and then cut the clones of the mother dip into clone x and then place into cube.Mist the clones twice a day for the 1st week then,once 1 a day after but they normaly root within the first 7/12 days but dont worrie if they take longer mist with just water nothing else.also a propagator is a real important tool in cloneing,leave vents closed for 1 st 2 days then open on day 3,this will give you nice green clones.............................tyke