Clones is when you get a clean cut of a nice branch or w/e and dip it in rooting solution, put it in a cube or w/e and place a plastic cover over it and mist it until it's ready to be put under bare light without the covering. Flushing is when you over water a plant or water it more than you usually do to get alot of the salt or extra nutrients out of the soil. Flushing is also used to clear the plant from all nutrients near the end of it's life.