The best place to start is to power wash or hose down the building to remove dirt and dust.
Scrub off the existing rust with vinegar; the acid in the vinegar will eat the rust away. Remember to use a steel brush.
Using a steel brush dipped in bleach will remove the mildew.
Once your building is dry, wipe with a cloth to make sure no chalky areas remain. Once it’s clean, apply the rust-inhabiting finish. An acrylic finish will protect against rust without changing the building’s color.
You can use a paint sprayer, brush, or roller to apply the finish to the entire building. You can tape off any parts you don’t want to come into contact with the acrylic. Allow 2 hours to dry.
Note: You should not work in temperatures below 50 degrees Fahrenheit.
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