I have a Yamaha horn in pretty good condition. I think it's a student horn but I cannot tell even what model it is. If it is a student or intermediate horn, would it be any use to me on gigs? What separates a professional horn from a student horn? Would the fact that it is Yamaha make it a good horn regardless to take to church performances or symphony concerts? I also want to know about cleaning it out: it had to be restored before I could play it and so Meyer Music used it's own oil and grease on it after they replaced the valves. I use Hetman's and I don't want to mix it with the MM stuff so how would I get the other grease and oil off before I put my Hetman's on? Just disassemble the axe and give each of the individual parts a bath and a scrub in warm water?