i have a valve guard that i think has fabric on the inside. i used it on my nickel plated yamaha trumpet and it didn't cause any tarnish. i just got a silver bach strad that has some silver wear around the valves. i want to use the valve guard on it so it doesn't get worse, but i have heard bad things about valve guards, so do you guys think that because it didn't cause problems on my yamaha it well be ok on my strad?
