i use rock wool ( the kind that is slit on the side so you can open it and place the cutting in with root gel instead of shoving the cutting in the rockwool and having the gel pushed upward.) i use alternativegardensupply gel and rockwool. always 100%...i actually just cloned some jus now. after you got your clones make sure u dont put them in to much intense light. i noticed that the clones are actually very well alive. when u put them under to much intense light they will wilt over to get away from the sun...and when u move them farther they will pop right back up...and this is right after cutting to , crazy huh. get a humidity dome...and make sure the rock wool isnt to drenched in water you want it toe be moist it will root faster that way.