Hetman has made a great trombone slide lubricant. HYDRO-SLIDE™ - slide spray concentrate and applicator for trombones. When added to water, Hydro-Slide™ forms an extraordinary lubricating fluid. Fill the applicator bottle with water to the "water line" then add Hydro-Slide™ concentrate to the desired level (1:40, 1:20 or 1:10). Mix thoroughly and spray on the trombone slide as needed.
The price includes the HydroSlide bottle to mix the concentrate to your desired level.