To clean your aluminum radiator or cooling system with Simple Green Pro HD:

1. Mix 1 part Simple Green Pro HD to 3 parts water.
2. Drain the cooling system.
3. Flush the system with clean water.
4. Fill the radiator with the Simple Green Pro HD solution.
5. Run the engine for the manufacturer's recommended amount of time.
6. Flush the system with clean water.
7. Fill the radiator with appropriate solution.

Always follow manufacturer's complete instructions for cleaning and maintenance.