So, I was having trouble with my valves and took my trumpet in. The technician said it needed ultrasonic cleaning, and they had to do something to get the "buildup" off the valves (did he say polish? I'm not sure). Now I bought the horn used, but it worked nicely when I got it, and have cleaned it regularly - but still ended up where the valves were getting worse. He asked what oil I was using - blue juice - and said that "can be ok," but after it's cleaned he'll want me to use yamaha light synthetic valve oil. Also suggested that I use that on my pocket trumpet. I'd thought I was using a good quality oil . . . The odd thing is, I have an olds ambassador that's circa 1970 that has never been professionally cleaned, and I've always used whatever valve oil was on hand. Should I throw out all the blue-juice I have, or just not use it on my Benge and Jupiter Pocket? (In other words reserve it for the mellophone that so far seems to work ok with it)? Anyone else have problems with blue juice?