How clean does my cloning equipment need to be?

Advanced Techniques GrowFAQ
1

It is critical that you sterilize everything before you start because cuttings are very susceptible to fungus, viruses and diseases until they root. Use rubbing alcohol on your hands, the razor blade and the cutting block. Rinse the shot glass (or whatever you are using) with alcohol, dry it and then fill it 3/4 full with rooting hormone.