Good info from gmonady. It's really tough, if not impossible to eradicate Staph aureus. When there are extenuating circumstances, I sometimes recommend eradication. But given the ubiquitous nature of it, it is not always successful. Also, listen to rowuk on the cleaning approach. If you don't get the "pizza" out of your horn first (with warm water, soap, and a brush), the alcohol won't get rid of the staph.