Scrub the rust off with a steel wool pad.
How to fix rust on bottom of garage door.
Rinse thoroughly and let dry.
Clean the bottom panel of the garage door with warm water and a grease fighting dish washing liquid.
First clean the entire door with the water and dishwashing liquid.
Dip a cloth into white vinegar and wipe the rusty area.
Close the garage door.
Cleaning steel and aluminum doors.
An alternate product might be corroseal which is a rust converter and latex primer in one which can then be topcoated with a latex paint.
Rinse and allow to dry.
How to fix a rusting bottom panel on a garage door.
The vinegar reacts with the rust and dissolves it.
In this video i focus on door bottom rust repair and will be showing you how to remove and replace a lower door skin on a car or truck.
The rust oleum product shown recommends an oil based top coat which should not be used when repainting a metal garage door.
Soak the cloth in white vinegar and wipe all rusted areas.