Steel is the material of choice for security doors. Although many are molded to look like wood, unlike wood, potential intruders cannot kick through these doors. Also, unlike wood, you don't have to worry about termites or rot. Steel doors are usually painted, and you have your choice of colors, although white is probably one of the most common. No matter the color, cleaning a steel door is very easy and you may be surprised how much better your door looks after you have cleaned it.
Open the steel door so you can access the top and all sides for cleaning. Use door stoppers on both sides so that it does not move or swing shut as you clean.
Gather your cleaning supplies.
Set up a step ladder on your floor so you can reach the top of the door. Put on a pair of vinyl or rubber gloves and, taking a dust cloth with you, ascend the ladder.
Wipe the top ledge of the door with the dust cloth, as mrscleanusa.com suggests. This is important because any dust left here will just find its way down to the door, eventually. If you wish, or if the top is significantly soiled, you can follow with a spray cleaner and a dampened cloth for deeper cleaning. Follow by wiping down the sides of the door.
Retrieve a soft, clean sponge. Dampen the sponge in the bucket of water; wring it out and then spray the sponge with your all-purpose cleaner. Scrub the door with the sponge, starting at the top and working your way down. You may need to stop to rinse out the sponge a few times or use a fresh clean sponge, as well as add more cleaner to the sponge.
Clean the other side of the door the same way. When you have finished, wipe both sides down with a clean sponge dipped in the water bucket. If your door has windows, clean them now. Spray the windows with glass cleaner and wipe them with a soft cloth. When you've cleaner the entire door, buff it dry with a clean towel.