To clean oil paint brushes, follow these steps:
1. Wipe off excess paint on a paper towel or rag.
2. Rinse the brush in a container of mineral spirits or paint thinner.
3. Gently massage the bristles to remove paint residue.
4. Repeat the rinsing and massaging process until the brush is clean.
5. Wash the brush with soap and warm water to remove any remaining solvent.
6. Reshape the bristles and let the brush air dry.
Remember to dispose of the used mineral spirits or paint thinner properly according to local regulations.