ive tried cloning almost every way you can and rockwool is the only one ive personally had 100% success with. cut at a 45 degree angle and dip in your solution. i use a gel and also a powder. usually add powder to rockwool and water it in. if your using a solution you might want to soak some into the rockwool as well. i put my cubes in a dish or a plate or something like that and always keep a little bit of water in the bottom for the cubes to soak up. never had a problem this way and like i said i even did this under natural sun light and outdoors