Work the ketchup around the door focusing in on the rusted spots and allow it to sit for 10 minutes before wiping it clean.
How to remove oxidation from metal garage door.
The garage doors are structually in great shape but there is a thin film of chaulky oxidation on the outside doors.
Using a clean bucket mix a small amount of dish soap or car wash soap preferred with water with a soft sponge or cloth apply the soap to the door in a circular motion rinse off with garden hose for steel or fiberglass doors apply a light coat of spray car wax.
Lightly sand or buff the imperfections be careful not to expose bare metal.
Ketchup helps oxidizes rust and tarnish eating through them so that the underneath metal looks new again.
Wash the door surfaces and windows of your garage with a mild liquid soap such as a car washing soap or dish washing soap and water.
Dawn tide and warm water.
Wash both the interior and exterior using a sponge cloth and or soft brush.
Rinse well and let dry.
Step 3 spray the surface of the metal door with the soapy mixture or tsp.
Do not use harsh or abrasive detergents.
Roughen the surface of the metal garage door with a hand sander and medium grit sandpaper.
If the garage door was installed in the past 2 years then you will want to be sure you remove any wax remaining on the door from the factory.
Sand the entire door not just the oxidized areas to help the primer stick to the door.
Exterior surfaces can take up to a full day to dry.
Rinse until water sheets off of the door and no bubbles remain.
Pressure wash according to proper guidelines and let the solution stay on the wall for up to 15 minutes before removing it.
A pressure washer loaded with a gentle cleaning solution should do the trick.
Place an old towel large rag or layer of newspaper at the bottom of the door to catch drips from the cleaning solution.
Jim mc namara 2003 06 24 18 34 20 utc.
Remove all chalk and oxidation wiping with a rag if necessary.
To remove any remaining wax use steel wool or synthetic steel wool equal to 000 soaked in soapy water.
Begin at the top of the door and allow the spray to run down the door.
This can damage the painted surface of the door or the seals.
Rinse at between 1500 and 2000 psi.