I just rooted 2 clones in nothing but Black Gold seedling mix and a 6 oz cup. 10 days.
I use 3 platic cups, one 6oz for the soil and clone, with a hole in the bottom, then I set that inside of a larger 8 oz cup that acts as my water rez...
Then set another 6oz cup on top to act as my dome.
The fastest way I have ever cloned though, was Ez Cloner, 16 site, follow their exact instructions and I end up with clones that are showing roots in about 4 days.