I clone in glass jars. I cut the clone, put it in water ( never use rooting gel), and put it in a small glass jar, covered with saran wrap with a hole in it. Then I put a larger jar over the whole thing. It allows for the humidity it needs, and keeps my stoner kitties from eating it. I then put it under a flourescent light over my kitchen sink and in about 4-5 days, you'll have the beginnings of roots. I let the roots grow to about an inch or two long, then plant.
I have been fortunate enough to have about a 99% success rate.