Have a new (well new to me) horn to play with which has been languishing in the storeroom of our band shack - since playing it (using my usual mouthpiece) I have noticed a really metallic taste in my mouth which really does not go away. Is it just me or has anyone else experienced this phenomenon? I would usually just use warm water to wash out a new instrument but have heard people recommend bicarbonate of soda - does anyone think this will solve the problem... and if so how much to a bathful of water??? If not do you have any other suggestions because I'm not sure I can stand this much longer and I really want to play this instrument as the valves don't stick (even if the 3rd valve slide is jammed solid) !!!! Any ideas?