Our chem cleaning process includes the following procedure: 

The instrument is disassembled, degreased, and soaked in mild acids to dissolve any deposits and brighten the metal. It is then thoroughly rinsed, and all tubes are polished inside and out. Stubborn deposits may be physically scraped off. The instrument is then reassembled with fresh lubricants, new corks and felts are added, and the valves are aligned. All reachable dents are removed and the instrument is polished as needed.