Things You'll Need
5 gallon bucket
Wooden spoon or spatula
Sponges (or sponge mop)
Stainless steel walls may show dirt more than most other walls. Even a thin layer of dust may take away from stainless steel's shine and beauty. Stainless steel is easy to clean, however, and you can bring back the original luster with little time or effort. You only need to remember a few basic rules: for example, as with many metals, you should avoid using abrasives, such as steel wool, or scouring cleansers, on stainless steel--these leave tiny scratches, dulling the appearance.
Place clean towels on the floor below the wall to absorb water that might drip down from cleaning the walls.
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Pour 4 to 5 cups of baking soda in a clean 5-gallon bucket. Add warm water and stir with a wooden spoon or a spatula to mix it together.
Wet a sponge or a sponge mop, if the wall is high, in the solution. Start scrubbing the stainless steel wall from the top down, rubbing with the grain.
Move on down the wall, scrubbing as you go--rinse the sponge in the solution again whenever the sponge looks soiled. If you come across greasy areas of the wall that aren't cleaned by the baking soda solution, add a drop of dish detergent to your sponge.
Pour the baking soda solution out of the bucket when you have scrubbed the whole wall. Rinse the bucket and refill with warm water.
Rinse out your sponge or sponge mop in a sink, under running water. Dip the sponge or sponge mop in the bucket of rinse water and rinse the wall. Again, start at the top and working your way down.
Buff the stainless steel wall dry with a towel. If the wall is high, attach the towel to the mop handle so you can reach the upper areas of the wall.
Julien.ca warns against using bleach on stainless steel as it may cause stains. In addition, avoid using any cleaning tools that contain metal, such as steel wool pads or steel brushes, or highly abrasive cleaning powders.