The Hetman synthetic lubricants are about the best lubricating products available for brass or woodwind instruments. They have a broad range of products for piston and rotary valves as well as trombone slide lubricants.
By using a Bob Reeves Mouthpipe Swab after each playing session you can ensure a long life and consistent playability from your instrument. Helps avoid pitting or "red rot" on the exterior of the mouthpipe. A great product to have on hand.