There are many things wrong in this video, how many can you spot?
Kind of breathtaking that someone who started as a trombonist and spent this much time in the business could do so many things to put an instrument and player at risk!
I find it distressing to think of how hard this makes it for a newbie to figure out if this is, or is not, good advice. The bio looks very good, and his presentation is excellent. Not a clue as to how bad most of the advice is.
The contrast with this video is huge:http://www.edwards-instruments.com/trombone/maintenance/slide_care.php
Just a few lowlights from the WD-40 video:
1) WD-40... should NOT be used where you will make a habit of breathing it in
2) BARE cleaning rod against ANY part of the slide... always buffer with some type of cloth cover
3) Run a half length of cloth into the outer slide... what happens if it gets jammed?
4) Loosen up crud with a brush and NOT FLUSH IT OUT... it it's going to be loosened, there should be flushing!
5) leaving the outer slide unheld at the angle he shows... if that slide is any good at all it will take almost NOTHING to send it banging to the floor.... straight up and down is a lot less risky.
There are actually more problems with this, and mis-statements. Basically, because of good coverage in readily available trombone books and videos like the one from Edwards, I won't go on.
But... how distressing!