How do I clean a steel garage door?
Cleaning a steel garage door is much like cleaning a wood door, although less caution is required. Simply dilute one cup of cleaner in five gallons of water and scrub the steel door clean, then rinse off with a hose or pressure washer. Use the same techniques to clean the inside of the door. If the door is fairly clean already, you can simply use a broom to clear away dust or cobwebs instead of completely washing.