Its just a light colored oxidation and the door being embossed with woodgrain its difficult to get it all off.
How to remove oxidation from a garage door.
Use a general purpose cleaner and go over the weather stripping around the garage door s edges as well as the rubber seal on the bottom of the door.
Acrylic paint holds up better than oil paint on outside surfaces because it undergoes oxidation more slowly.
Garage door finishes need to be cleaned regularly most manufacturers recommend a yearly washing.
Does anyone not of a mixture that can be sprayed on to remove the oxidation without harming the factory paint.
For flat doors use a paint roller but for doors with heavy ridges stick with a paintbrush.
Work the ketchup around the door focusing in on the rusted spots and allow it to sit for 10 minutes before wiping it clean.
As a final step you should clean and organize the areas around the garage door.
Jim mc namara 2003 06 24 18 34 20 utc.
The weather stripping around your garage door helps to keep the air inside your garage comfortable and all of the bugs and the elements outside where they belong.
It was a sunny day but it was not beating on the door at the time.
Spray your door with water and then squirt it with ketchup.
Remove any stacks or objects that could fall over and obstruct the path of the garage door or damage the track.
Ketchup helps oxidizes rust and tarnish eating through them so that the underneath metal looks new again.
I hesitate to use anything that would agressively remove the oxidation like an aluminum siding wash because i know that you can thin the colored coating or go thru it.
Both light and oxygen make paint less bright and viscous.
That will help to insulate your garage as well as to keep rodents and insects out.
Dirt and oxidation can build up on your garage door over the course of time and this annual washing will keep your garage door looking its best and increase the life of the garage door finish.
Paint the garage door with a primer that contains zinc chromate to help halt the oxidation.
After chalking occurs rain may remove the powder leaving paint on the outer surface thinner than it was before.