Follow these steps:
1. Clean the canister by rinsing with proper solvent.
2. Spray the solvent through the gun while the shaking canister.
3. Wipe off the gun with a rag that’s been sprayed with solvent.
4. Repeat steps 1 – 3, then proceed to step 5.
5. Clean the air cap.
6. Oil moving parts with 3-IN-ONE® multipurpose oil. Do not use WD-40.