I'm looking to buy an ultrasonic cleaning system for my horns, but until I can afford one, does anyone know what products are used for a typical chem clean? I've got a few silver horns and a few lacquer and one raw brass. I'll be starting with some old junk horns so harm done if I ruin them. Do you use different chemicals for each finish or the same batch for all three finishes? If anyone has an ultrasonic cleaning system, where did you get it and is it worth it? Thanks.