Materials:
Painter's Tape (optional), Rust-oleum Aircraft Stripper, Brasso, Steel Wool Grade #0000, Rubber Gloves, Rust-oleum Matte Clear Enamel. Bought at Walmart and an auto parts store for ~$25.
Process:
1. Prior to the before photos, I have it a lukewarm bath with dawn dish soap
2. Set up the removal area outside (or in a well ventilated area). You will need a sheet, rags/towels, aircraft stripper, gloves, Brasso, and steel wool grade #0000.
3. (Optional) I put painter's tape on the inside of the bell in order to keep the lacquer.
4. Lay out all pieces of the trombone on the sheet. Cover the inner slide with a towel or sheet. Spray aircraft stripper on the trombone. Wait 15 minutes. WEAR GLOVES!
5. Wipe off the aircraft stripper with a rag. The lacquer will come right off. WEAR GLOVES!
6. Apply Brasso using the steel wool grade #0000. This step is key, or the raw brass will look spotted and tarnished. This step also takes the longest, but it is worth it. WEAR GLOVES!
7. Wash off the trombone. I sprayed it with the hose and snaked the tubes.
8. Let dry completely before applying the Matte Clear Enamel
9. Let the Matte Clear Enamel dry for 30 minutes
Please note: This may not be the "right" way to do it, but I had great results.
Backstory: I found this Conn 88H on Facebook Marketplace in my area for $25. It was left in a garage for a long time and not played for years. I am not sure what caused the orange tarnish and lacquer damage in the before photos.