Not everyone lives near a tech, nor can they all afford to send a horn off to a tech.
Recently, I repaired a horn for a local high school. The music director is a sax player in our community band. When returning the horn, I informed him that it needed a thorough cleaning, as there were massive calcium deposits throughout the horn. It had obviously not been cleaned in a long time. He also informed me that the school did not have a maitenence program for their instruments, to which I asked, which is cheaper, cleaning and maintaining their instruments, or purchasing new ones to replace the old?
There are few trumpet instructors in the area, who could instruct their students in trumpet maitenence. So, to have one attempt to do so, is what? Irresponsible?