Yamaha Cornets Owner's Manual - Page 12

Maintenance ■ Twice Yearly Maintenance ● Cleaning the instrument 1. Make a brass soap water solution. Prepare a brass soap water solution using between 10 to 15 parts warm water (30° to 40° C) and 1 part brass soap. Before putting the instrument into the soap water solution, remove the pistons, valve casing covers, slide valves. 2. With the instrument removed from the wa- ter, apply some soap water solution to a flexible cleaner and use the cleaner to clean the inside of the instrument's pipes. ● Cleaning the mouthpiece 1. Dip the mouthpiece brush in the brass soap water solution and clean the mouthpiece throat with the brush. Rinse the mouthpiece out with clean water. Mouthpiece brush Flexible cleaner 3. After cleaning the instrument, use clean water and thoroughly rinse out the brass soap water solution. After that, apply valve oil and slide grease and reassemble the instrument. 24